Change stdlib merkle tree implementation to use pedersen_hash

[kevaundray]

Problem

Before changing pedersen, we were using pedersen_commitment as a hash function by taking the x coordinate.

Now this has changed, some of our code is still using pedersen_commitment instead of pedersen_hash.

See this comment on what needs to change

Happy Case

Change merkle tree stdlib to use pedersen_hash and change the test vectors

Alternatives Considered

No response

Additional Context

No response

Would you like to submit a PR for this Issue?

No

Support Needs

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