Draft IndexedMerkleTree

[Hrom131]

• This PR suggests a bug fix, I've added the necessary tests and the coverage is 100%.
• This PR introduces a new feature, I've discussed the update in an Issue or with the team.
• This PR is just a minor change, like a typo fix.

---

[codecov]

Codecov Report

❌ Patch coverage is 93.84615% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 99.75%. Comparing base (2f855a5) to head (04451e1).
⚠️ Report is 7 commits behind head on master.

Files with missing lines	Patch %	Lines
...ntracts/libs/data-structures/IndexedMerkleTree.sol	93.84%	1 Missing and 7 partials ⚠️

❌ Your patch check has failed because the patch coverage (93.84%) is below the target coverage (99.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #174      +/-   ##
==========================================
- Coverage   99.88%   99.75%   -0.14%     
==========================================
  Files          55       57       +2     
  Lines        5378     5687     +309     
  Branches     5378     5687     +309     
==========================================
+ Hits         5372     5673     +301     
- Misses          0        1       +1     
- Partials        6       13       +7     

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