fix: Fix storeInt64 write value alignment

[acuarica]

Description:

This PR fixes the storeInt64 function to properly write the given value.

In addition, it improves NatSpec comments for newly introduced libraries.

Related issue(s):

Fixes #288.

Notes for reviewer:

Checklist

• Documented (Code comments, README, etc.)
• Tested (unit, integration, etc.)

[swirlds-automation]

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.37%. Comparing base (8462a80) to head (1323667).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #289   +/-   ##
=======================================
  Coverage   89.37%   89.37%           
=======================================
  Files          23       23           
  Lines        2372     2372           
  Branches      213      213           
=======================================
  Hits         2120     2120           
  Misses        194      194           
  Partials       58       58           

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