(fix:) returned error name (#54)

After refactoring of relay-api error namings improved, thus we need to
change value here in tests

Update rpcserver to goccy/go-json (#51)

JSON en/decoding can be bottlenecking.

Switching to https://github.com/goccy/go-json is worth a shot

set request size in request context (#48)

enrich rpc related metrics with bool size classifier (#47)

eth_sendBundle update with refundIdentity (#46)

- New field for eth_sendBundle
- Improved comments

fix tls key permissions (#45)

added GetOrGenerateTLS (#44)

This pull request introduces a new utility function, `GetOrGenerateTLS`,
in the `tls/tls_generate.go` file. The function simplifies handling TLS
certificates by attempting to load them from specified paths or
generating and saving new ones if they do not exist.

### TLS Certificate Management:
* Added the `GetOrGenerateTLS` function to load TLS certificates and
keys from specified paths, or generate and save new self-signed
certificates and keys if the files are missing. This includes error
handling for file operations and certificate generation.
(`tls/tls_generate.go`,
[tls/tls_generate.goR14-R54](diffhunk://#diff-dcccc347b7f85fe0c7ad6329e730d69c035152c1993c176b6a8680c1c208949bR14-R54))

Versioned bundles support and proper identifiers for `v2` (#41)

Extend (in a backwards compatible fashion) `bundle` model with `version`
field.
Support deterministic unique identifiers for such bundles

chore: Update to newer geth and tooling in anticipation of Pectra (#40)

Replaces #37 because that one is on Ryan's personal repo.

---

We need to update to geth 1.15.0 or higher for Pectra since that's the
version that includes `Transaction.UnmarshalBinary` support for the new
tx type 4 introduced in EIP-7702.

This required some other fixes as well:

- Build with go 1.23 or higher.
- We were using the wrong `slog` package.

---------

Co-authored-by: Ryan Schneider <[email protected]>

bundle: allow 0 block number, empty txs (#38)