Merge bitcoin/bitcoin#23380: addrman: Fix AddrMan::Add() return semantics and logging

61ec0539b26a902a41a2602187a71f9dba3c6935 [MOVEONLY] reorder functions in addrman_impl.h and addrman.cpp (John Newbery)
2095df7b7bfcb9ab0c5710a93112f7f341e753c9 [addrman] Add Add_() inner function, fix Add() return semantics (John Newbery)
2658eb6d68460272deefb3fcc653b03f6ec6e7cf [addrman] Rename Add_() to AddSingle() (John Newbery)
e58598e833d5737900fe3c4369e26f2a08166892 [addrman] Add doxygen comment to AddrMan::Add() (John Newbery)

Pull request description:

  Previously, Add() would return true if the function created a new
  AddressInfo object, even if that object could not be successfully
  entered into the new table and was deleted. That would happen if the new
  table position was already taken and the existing entry could not be
  removed.

  Instead, return true if the new AddressInfo object is successfully
  entered into the new table. This fixes a bug in the "Added %i addresses"
  log, which would not always accurately log how many addresses had been
  added.

ACKs for top commit:
  naumenkogs:
    ACK 61ec0539b26a902a41a2602187a71f9dba3c6935
  mzumsande:
    ACK 61ec0539b26a902a41a2602187a71f9dba3c6935
  shaavan:
    ACK 61ec0539b26a902a41a2602187a71f9dba3c6935

Tree-SHA512: 276f1e8297d4b6d411d05d06ffc7c176f6290a784da039926ab6c471a8ed8e9159ab4f56c893b1285737ae292954930f0d28012d89dfb3f2f825d7df41016feb

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