Config registry (#10683)

* test coverage and updates to config twiddlers

* LoadChainConfigFile error if SetActive conflicts

* lint

* wip working around test issues

* more fixes, mass test updates

* lint

* linting

* thanks deepsource!

* fix undeclared vars

* fixing more undefined

* fix a bug, make a bug, repeat

* gaz

* use stock mainnet in case fork schedule matters

* remove unused KnownConfigs

* post-merge cleanup

* eliminating OverrideBeaconConfig outside tests

* more cleanup of OverrideBeaconConfig outside tests

* config for interop w/ genesis gen support

* improve var name

* API on package instead of exported value

* cleanup remainders of "registry" naming

* Nishant feedback

* add ropstein to configset

* lint

* lint #2

* ✂️

* revert accidental commented line

* check if active is nil (replace called on empty)

* Nishant feedback

* replace OverrideBeaconConfig call

* update interop instructions w/ new flag

* don't let interop replace config set via cli flags

Co-authored-by: kasey <kasey@users.noreply.github.com>

testing/benchmark/pregen.go

@@ -92,14 +92,19 @@ func PreGenFullBlock() (*ethpb.SignedBeaconBlock, error) {
 
 // SetBenchmarkConfig changes the beacon config to match the requested amount of
 // attestations set to AttestationsPerEpoch.
-func SetBenchmarkConfig() {
+func SetBenchmarkConfig() (func(), error) {
 	maxAtts := AttestationsPerEpoch
 	slotsPerEpoch := uint64(params.BeaconConfig().SlotsPerEpoch)
 	committeeSize := (ValidatorCount / slotsPerEpoch) / (maxAtts / slotsPerEpoch)
-	c := params.BeaconConfig()
+	c := params.BeaconConfig().Copy()
 	c.ShardCommitteePeriod = 0
 	c.MinValidatorWithdrawabilityDelay = 0
 	c.TargetCommitteeSize = committeeSize
 	c.MaxAttestations = maxAtts
-	params.OverrideBeaconConfig(c)
+	undo, err := params.SetActiveWithUndo(c)
+	return func() {
+		if err := undo(); err != nil {
+			panic(err)
+		}
+	}, err
 }