feat(tm2/pkg/iavl): add FuzzIterateRange and modernize FuzzMutableTree

[odeke-em]

This change hooks MutableTree fuzzing to Go's native fuzzing that's more intelligent and coverage guided to mutate inputs instead of naive random program generation.
While here also added FuzzIterateRange.

Updates #3087

[Gno2D2]

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[jefft0]

Hello @odeke-em . Can you fix the Go Lint error?

[odeke-em]

Done and thanks for the ping @jefft0, please take a look.

[notJoon]

LGTM

remove review/triag-pending flag.

[thehowl]

overall lgtm