Custom inspection function on Objects via .inspect() is deprecated

This deprecation error was handled in bcoin in https://github.com/bcoin-org/bcoin/pull/715

Looks like most of the big objects in hsd bypassed this issue by extending `bio.struct` in https://github.com/handshake-org/hsd/commit/d4782e0cc115042816b710c56ebf4b6be2672a76, which in turn was fixed here: https://github.com/bcoin-org/bufio/commit/da320cf5554b00fe73ca2c6be04b705c58a8a538

A quick grep of hsd for `inspect()` returned 27 matches across 15 files.

I can make a PR for this soon, just opening an issue now as a TODO.

Start by reviewing the 27 `inspect()` matches across 15 hsd files, then compare the handling in bcoin pull request 715 and the referenced bufio fix. Done means updating the affected custom inspection uses so the deprecation is handled consistently across hsd.

Written by the indexing model from the issue text.