* first working implementation
* assertions tests
* adds to requires
* merges assert and require tests into a single suite
* gazelle
* Merge branch 'merge-assert-require-tests' into assert-logs-contains-move-to-assertions
* gazelle
* updates references
* fixes build issue
* Merge branch 'master' into assert-logs-contains-move-to-assertions
* Merge refs/heads/master into assert-logs-contains-move-to-assertions
* Merge branch 'master' into assert-logs-contains-move-to-assertions
* fixes build issue
* Merge branch 'assert-logs-contains-move-to-assertions' of github.com:prysmaticlabs/prysm into assert-logs-contains-move-to-assertions
* Merge refs/heads/master into assert-logs-contains-move-to-assertions
* Merge refs/heads/master into assert-logs-contains-move-to-assertions
* cache and retrieval of validator public keys
* fix comments
* fix comment
* fix variables
* gaz
* ivan feedback fixes
* goimports
* fix test
* comments on in line slice update
Co-authored-by: terence tsao <terence@prysmaticlabs.com>