optimise TransactionFetcher

[emhane]

adds retry logic to TransactionManager with introducing buffered_hashes cache and tracks retries per TxHash.

packs eth68 GetPooledTransactions requests with respect to size metadata for requests that go out as a consequence of processing a newly received NewPooledTransactionHashes.

what remains to close https://github.com/orgs/paradigmxyz/projects/1/views/13?pane=issue&itemId=38236437:

• storing eth68 meta data in cache alongside unknown_hashes for also packing retried requests with respect to size metadata

tbc

[mattsse]

some suggestions re the shared request counter.

still need to take a closer look at the TransactionFetcher, but so far I was able to follow.

[mattsse]

this looks great!
tests are looking good.

I have a few smol suggestions and questions, but overall this was easy to follow.

The debug_asserts are also very helpful here to understand the invariants

[mattsse]

nice!

left last nits re docs, and an optional suggestion.

I see we have a few warn! now and I believe those are leaking into the CLI output, right @shekhirin ?

should we downgrade them to debug?

[shekhirin]

I see we have a few warn! now and I believe those are leaking into the CLI output

yes