[TieredStorage] Enable AccountsFile::TieredHot

[yhchiang-sol]

Problem

AccountsFile is an enum that allows different implementations of AccountsFile. It currently supports AppendVec and does not have one for TieredStorage.

Summary of Changes

This PR adds TieredHot to AccountsFile.

Dependency

#35224

[codecov[bot]]

Codecov Report

Attention: 35 lines in your changes are missing coverage. Please review.

Comparison is base (d87e7bc) 81.6% compared to head (bfda7f6) 81.6%. Report is 12 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##           master   #35066     +/-   ##
=========================================
- Coverage    81.6%    81.6%   -0.1%     
=========================================
  Files         833      833             
  Lines      224768   224875    +107     
=========================================
+ Hits       183475   183553     +78     
- Misses      41293    41322     +29     

[willhickey]

This repository is no longer in use. Please re-open this pull request in the agave repo: https://github.com/anza-xyz/agave