fix: update function visibility (OZ N-16)

[MoonBoi9001]

Motivation:

• This PR addresses the following N-16 OZ audit issue, applying the recommended fixes.

Title:

N-16 Function Visibility Overly Permissive

Details:

Throughout the codebase, multiple instances of functions with unnecessarily permissive visibility were identified:

The _verifyAllocationProof function in AllocationManager.sol with internal visibility could be limited to private.
The _getDelegatedTokensAvailable function in HorizonStakingBase.sol with internal visibility could be limited to private.
The _receiveIndexerStake and _receiveDelegation functions in HorizonStakingExtension with internal visibility could be made private.
The _deposit function in PaymentsEscrow.sol with internal visibility could be limited to private.
The acceptDispute and drawDispute functions in DisputeManager.sol with public visibility could be limited to external.
To better convey the intended use of functions, consider changing a function's visibility to be only as permissive as required.

Key changes

• set _verifyAllocationProof visability private.
• set _getDelegatedTokensAvailable visability private.
• set both _receiveIndexerStake and _receiveDelegation function visability private.
• set _deposit visability private.
• set drawDispute visability external.

[openzeppelin-code]

fix: update function visibility (OZ N-16)

Generated at commit: 32b39657bb2b462ac4c02068dba688318788ce65

🚨 Report Summary

	Severity Level	Results
Contracts	Critical High Medium Low Note Total	2 4 0 15 40 61
Dependencies	Critical High Medium Low Note Total	0 0 0 0 0 0

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For more details view the full report in OpenZeppelin Code Inspector

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.51%. Comparing base (374f57d) to head (32b3965).
Report is 45 commits behind head on horizon.

Additional details and impacted files

@@           Coverage Diff            @@
##           horizon    #1051   +/-   ##
========================================
  Coverage    92.51%   92.51%           
========================================
  Files           46       46           
  Lines         2392     2392           
  Branches       428      428           
========================================
  Hits          2213     2213           
  Misses         179      179           

Flag	Coverage Δ
unittests	92.51% <100.00%> (ø)

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[tmigone]

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