fix(brc20): verify ordinal transfers in chunks instead of individually

[rafaelcr]

Some Bitcoin blocks contain tens of thousands (or hundreds of thousands) of ordinal transfers. The BRC-20 indexer needs to look at each of these to see if any transfer operation was sent to another address (thus generating a transfer_send operation). This is currently extremely slow on our production deployments because it represents 1 roundtrip to postgres for every transfer we need to check.

This PR makes sure that when we analyze these we do so in chunks in order to minimize the roundtrip overhead to and from postgres thus making indexing much faster.

[codecov]

Codecov Report

Attention: Patch coverage is 93.71429% with 11 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...rdhook-core/src/core/meta_protocols/brc20/cache.rs	70.83%	7 Missing ⚠️
...ook-core/src/core/meta_protocols/brc20/brc20_pg.rs	86.66%	2 Missing ⚠️
...rdhook-core/src/core/meta_protocols/brc20/index.rs	98.00%	2 Missing ⚠️

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