Improve logs (#16075)

**What type of PR is this?**
Other

**What does this PR do? Why is it needed?**
- Added log prefix to the `genesis` package.
- Added log prefix to the `params` package.
- `WithGenesisValidatorsRoot`: Use camelCase for log field param.
- Move `Origin checkpoint found in db` log from WARN to INFO, since it
is the expected behaviour.

**Other notes for review**
Please read commit by commit

**Acknowledgements**

- [x] I have read
[CONTRIBUTING.md](https://github.com/prysmaticlabs/prysm/blob/develop/CONTRIBUTING.md).
- [x] I have included a uniquely named [changelog fragment
file](https://github.com/prysmaticlabs/prysm/blob/develop/CONTRIBUTING.md#maintaining-changelogmd).
- [x] I have added a description to this PR with sufficient context for
reviewers to understand this PR.

beacon-chain/sync/checkpoint/api.go

@@ -44,7 +44,7 @@ func NewAPIInitializer(beaconNodeHost string) (*APIInitializer, error) {
 func (dl *APIInitializer) Initialize(ctx context.Context, d db.Database) error {
 	origin, err := d.OriginCheckpointBlockRoot(ctx)
 	if err == nil && origin != params.BeaconConfig().ZeroHash {
-		log.Warnf("Origin checkpoint root %#x found in db, ignoring checkpoint sync flags", origin)
+		log.WithField("root", fmt.Sprintf("%#x", origin)).Info("Origin checkpoint found in the database, ignoring checkpoint sync flags")
 		return nil
 	}
 	if err != nil && !errors.Is(err, db.ErrNotFound) {

beacon-chain/sync/checkpoint/file.go

@@ -44,7 +44,7 @@ type FileInitializer struct {
 func (fi *FileInitializer) Initialize(ctx context.Context, d db.Database) error {
 	origin, err := d.OriginCheckpointBlockRoot(ctx)
 	if err == nil && origin != params.BeaconConfig().ZeroHash {
-		log.Warnf("Origin checkpoint root %#x found in db, ignoring checkpoint sync flags", origin)
+		log.WithField("root", fmt.Sprintf("%#x", origin)).Info("Origin checkpoint found in the database, ignoring checkpoint sync flags")
 		return nil
 	} else {
 		if !errors.Is(err, db.ErrNotFound) {