* fix: wrong configuration for the eth connection pool.

* add a specific error for missing RPC URL

* fix key prefix in config.toml of the example listener

* fix: wrong configuration for the eth connection pool.

* make WS client an optional one

* add tests for connection_pool.go

* fix lint errors

* refactor: improved eth.ConnectionPoolImpl

* rename function getClient in getClientFrom

* move mutex usage to user-facing functions

* fix: skip tests for ConnectionPoolImpl if the env vars are not set.

* Add a checkEnv function used to skip the test if the env vars are not set.

* Remove unneeded nil checks for HTTP clients cache

* Check if the WS Url cache is null before adding WS clients to the cache.

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Co-authored-by: Bearetta <[email protected]>

* Better syntax

* update Makefile

* ree

* ree

* use go 1.23

* use concise go version

* fix ci

* fix ci