[move-only] Match ordering of CAddrMan declarations and definitions

Summary:

Also move `Check` and `ForceCheckAddrman` to be after the `FunctionName_` functions.

Also move Clear() at the end together with MakeDeterministic(), as both these methods don't exist in core's codebase.

Partial backport of core#22950:
https://github.com/bitcoin/bitcoin/pull/22950/commits/f2e5f38f09ee40933f752680fe7d75ee8e529fae

Depends on D12327.

Test Plan:

ninja all check-all

Reviewers: #bitcoin_abc, PiRK

Reviewed By: #bitcoin_abc, PiRK

Differential Revision: https://reviews.bitcoinabc.org/D12328