* Migrate Prysm repo to Offchain Labs organization ahead of Pectra upgrade v6
* Replace prysmaticlabs with OffchainLabs on general markdowns
* Update mock
* Gazelle and add mock.go to excluded generated mock file
* wip
* gaz
* rename field
* sammy review
* updating execution api request and reverting response back
* fixing linting
* changelog
* changelog
* adding in serialization of requests
* code cleanup
* adding some happy path tests and fixing mock
* mock still broken
* fixing linting
* updating name on proto
* missed naming
* placeholder fix for TestClient_HTTP
* removing duplicate change log
* adding in test for get payloadv4 as well as some tests
* added tests for execution client testing, fixed encode type
* adding comment for placeholder test
* fixing test and addressing feedback
* feedback
* flipping the test names, was used in reverse
* feedback from kasey
* reverting switch back to if statements to fix bug
* lint
