Merge bitcoin/bitcoin#27598: bench: Add SHA256 implementation specific benchmarks

ce6df7df9bab2405cfe7d6e382f5682cf30de476 bench: Add SHA256 implementation specific benchmarks (Hennadii Stepanov)
5f72417176cfffece9a5aa11e97d5a6599c51e7a Add ability to specify SHA256 implementation for benchmark purposes (Hennadii Stepanov)

Pull request description:

  On the master branch, only the best available `SHA256` implementation is being benchmarked. This PR makes `bench_bitcoin` benchmark all `SHA256` implementations that are available on the system.

  For  example:
  - on Linux:
  ```
  $ ./src/bench/bench_bitcoin -filter=SHA.*
  Using the 'x86_shani(1way,2way)' SHA256 implementation

  |             ns/byte |              byte/s |    err% |     total | benchmark
  |--------------------:|--------------------:|--------:|----------:|:----------
  |                1.00 |    1,002,545,462.93 |    0.4% |      0.01 | `SHA1`
  |                2.91 |      344,117,991.18 |    0.1% |      0.03 | `SHA256 using the 'standard' SHA256 implementation`
  |                2.21 |      453,081,794.40 |    0.1% |      0.02 | `SHA256 using the 'sse4(1way),sse41(4way)' SHA256 implementation`
  |                2.21 |      453,396,506.58 |    0.1% |      0.02 | `SHA256 using the 'sse4(1way),sse41(4way),avx2(8way)' SHA256 implementation`
  |                0.53 |    1,870,520,687.49 |    0.1% |      0.01 | `SHA256 using the 'x86_shani(1way,2way)' SHA256 implementation`
  |                7.90 |      126,627,134.33 |    0.0% |      0.01 | `SHA256D64_1024 using the 'standard' SHA256 implementation`
  |                3.94 |      253,850,206.07 |    0.0% |      0.01 | `SHA256D64_1024 using the 'sse4(1way),sse41(4way)' SHA256 implementation`
  |                1.40 |      716,247,553.38 |    0.4% |      0.01 | `SHA256D64_1024 using the 'sse4(1way),sse41(4way),avx2(8way)' SHA256 implementation`
  |                1.26 |      792,706,270.13 |    0.9% |      0.01 | `SHA256D64_1024 using the 'x86_shani(1way,2way)' SHA256 implementation`
  |                6.75 |      148,172,097.64 |    0.2% |      0.01 | `SHA256_32b using the 'standard' SHA256 implementation`
  |                4.90 |      204,156,289.96 |    0.1% |      0.01 | `SHA256_32b using the 'sse4(1way),sse41(4way)' SHA256 implementation`
  |                4.90 |      204,101,274.22 |    0.1% |      0.01 | `SHA256_32b using the 'sse4(1way),sse41(4way),avx2(8way)' SHA256 implementation`
  |                1.70 |      589,052,595.35 |    0.4% |      0.01 | `SHA256_32b using the 'x86_shani(1way,2way)' SHA256 implementation`
  |                2.21 |      453,441,736.14 |    1.0% |      0.02 | `SHA3_256_1M`
  |                1.92 |      521,807,101.48 |    1.0% |      0.02 | `SHA512`
  ```

  - on macOS (M1):
  ```
  % ./src/bench/bench_bitcoin -filter=SHA.\*
  Using the 'arm_shani(1way,2way)' SHA256 implementation

  |             ns/byte |              byte/s |    err% |     total | benchmark
  |--------------------:|--------------------:|--------:|----------:|:----------
  |                1.36 |      737,644,274.00 |    0.6% |      0.02 | `SHA1`
  |                3.08 |      324,556,777.15 |    0.2% |      0.03 | `SHA256 using the 'standard' SHA256 implementation`
  |                0.45 |    2,198,104,135.18 |    0.3% |      0.01 | `SHA256 using the 'arm_shani(1way,2way)' SHA256 implementation`
  |                8.84 |      113,131,299.18 |    0.0% |      0.01 | `SHA256D64_1024 using the 'standard' SHA256 implementation`
  |                0.94 |    1,059,406,239.36 |    0.0% |      0.01 | `SHA256D64_1024 using the 'arm_shani(1way,2way)' SHA256 implementation`
  |                6.17 |      162,050,659.51 |    0.2% |      0.01 | `SHA256_32b using the 'standard' SHA256 implementation`
  |                1.15 |      866,637,155.98 |    0.0% |      0.01 | `SHA256_32b using the 'arm_shani(1way,2way)' SHA256 implementation`
  |                1.69 |      592,636,491.59 |    0.2% |      0.02 | `SHA3_256_1M`
  |                1.89 |      528,785,775.66 |    0.0% |      0.02 | `SHA512`
  ```

  Found it useful, while working on https://github.com/bitcoin/bitcoin/pull/24773.

ACKs for top commit:
  martinus:
    ACK ce6df7df9bab2405cfe7d6e382f5682cf30de476. I would have created a helper function in the test to avoid the code duplication for each test, but that's just me nitpicking. Here are results from my Ryzen 7950X, with `./src/bench/bench_bitcoin -filter="SHA256.*" -min-time=1000`:
  MarcoFalke:
    review ACK ce6df7df9bab2405cfe7d6e382f5682cf30de476 🏵
  sipa:
    ACK ce6df7df9bab2405cfe7d6e382f5682cf30de476

Tree-SHA512: e3de50e11b9a3a0d1e05583786041d4dc9afa2022e2115d75d6d1f63b11f62f6336f093001e53a631431d558c4dae29c596755c9e2d6aa78c382270116cc1f7f

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