Merge bitcoin/bitcoin#25862: refactor, kernel: Remove gArgs accesses from dbwrapper and txdb

aadd7c5b9b43a38beaa954b4cb8c2fff55f2200f refactor, validation: Add ChainstateManagerOpts db options (Ryan Ofsky)
0352258148c51572426666d337c7b28d0033376c refactor, txdb: Use DBParams struct in CBlockTreeDB (Ryan Ofsky)
c00fa1a7341d3f47f992e0beb043da655cbca777 refactor, txdb: Add CoinsViewOptions struct (Ryan Ofsky)
2eaeded37f3a07c35eef38d9a80c1e5fbd4d41ee refactor, dbwrapper: Add DBParams and DBOptions structs (Ryan Ofsky)

Pull request description:

  Code in the libbitcoin_kernel library should not be calling `ArgsManager` methods or trying to read options from the command line. Instead it should just get options values from simple structs and function arguments that are passed in externally. This PR removes `gArgs` accesses from `dbwrapper` and `txdb` modules by defining appropriate options structs, and is a followup to PR's #25290 #25487 #25527 which remove other `ArgsManager` calls from kernel modules.

  This PR does not change behavior in any way. It is a simpler alternative to #25623 because the only thing it does is remove `gArgs` references from kernel code. It avoids other unnecessary changes like adding options to the kernel API (they can be added separately later).

ACKs for top commit:
  TheCharlatan:
    Code review ACK aadd7c5b9b43a38beaa954b4cb8c2fff55f2200f
  achow101:
    ACK aadd7c5b9b43a38beaa954b4cb8c2fff55f2200f
  furszy:
    diff ACK aadd7c5b

Tree-SHA512: 46dfd5d99ab3110492e7bba97a87122c831b8344caaf7dd2ebdb6e0ad6aa9174d4d1832d6f3a7465eda9294fe50defaa3c000afbbddc4e72838687df09a63ffd

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