Merge bitcoin/bitcoin#23962: Use `int32_t` type for most transaction size/weight values

3ef756a5b558a1dd2fcb93bc0d4237707aa04f3f Remove txmempool implicit-integer-sign-change sanitizer suppressions (Hennadii Stepanov)
d2f6d2a95a9f6c1632c1ed3b5b5b67a49eb71d6b Use `int32_t` type for most transaction size/weight values (Hennadii Stepanov)

Pull request description:

  From bitcoin/bitcoin#23957 which has been incorporated into this PR:
  > A file-wide suppression is problematic because it will wave through future violations, potentially bugs.
  >
  > Fix that by using per-statement casts.
  >
  > This refactor doesn't change behavior because the now explicit casts were previously done implicitly.
  >
  > Similar to commit 8b5a4de904b414fb3a818732cd0a2c90b91bc275

ACKs for top commit:
  achow101:
    ACK 3ef756a5b558a1dd2fcb93bc0d4237707aa04f3f
  0xB10C:
    ACK 3ef756a5b558a1dd2fcb93bc0d4237707aa04f3f. I've focused my testing and code review on the tracepoint related changes. The docs, the test, and the mempool_monitor.py demo script are updated. I ran the `interface_usdt_mempool.py` test and the `mempool_monitor.py` script. The `mempool_monitor.py` output looks correct.
  Xekyo:
    codereview ACK 3ef756a5b558a1dd2fcb93bc0d4237707aa04f3f
  ryanofsky:
    Code review ACK 3ef756a5b558a1dd2fcb93bc0d4237707aa04f3f. Since last review, just rebased with more type changes in test and tracing code

Tree-SHA512: 397407f72165b6fb85ff1794eb1447836c4f903efed1a05d7a9704c88aa9b86f330063964370bbd59f6b5e322e04e7ea8e467805d58dce381e68f7596433330f

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