Fix(WIP): hex and JSON to SIP003 encoding migration for chainstate databases#6586

Draft

jcnelson wants to merge 7 commits intostacks-network:developfrom

jcnelson:fix/hex-to-bin-db-migration

Commits on Oct 10, 2025

feat: add ColumnEncoding enum to describe how a database's columns ought to be encoded on disk
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feat: macro to automatically implement SqlEncoded trait for various common types that would be candidates for a reencoding from hex or JSON to a binary representation
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chore: store column encoding in sortition DB config and load it to determine how to read and write the DB. Also, switch away from get_unwrap() to get()
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feat: represent memo fields as a BurnOpMemo struct instead of a raw vec, in order to make reencoding easier and unambiguous
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feat: update SortitionDBMigrator to reencode all tables from hex or JSON into binary. Add a macro to facilitate generating the code to perform the conversions, and add a macro to synthesize tests f…
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chore: Pervasively throughout the codebase, use `.sqlhex()` instead of the macro-implemented `FromSql` and `ToSql` to preserve the existing behavior.
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Merge remote-tracking branch 'stacks-network/develop' into fix/hex-to-bin-db-migration
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