Ar/psr 11 oncelock

[allanbrondum]

Purpose

Replace the usages of RwLock with OnceLock, that is a simpler and more lightweight synchronization primitive. Reading the value in a OnceLock e.g. has almost no overhead. And you can borrow the value (no guard needed like for RwLock).

Changes

• Changed HashedCacheableRef to use OnceLock
• Changed HashedCacheableRef::with_value to HashedCacheableRef::value that borrows the value
  from HashedCacheableRef is it is memory (no read closure needed).

Checklist

• My code follows the style of this project.
• The code compiles without warnings.
• I have performed a self-review of the changes.
• I have documented my code, in particular the intent of the
  hard-to-understand areas.
• (If necessary) I have updated the CHANGELOG.

[codecov]

Codecov Report

❌ Patch coverage is 96.87500% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 63.87%. Comparing base (4587fd4) to head (1858313).
⚠️ Report is 14 commits behind head on feature/rust_block_state.

Files with missing lines	Patch %	Lines
...state/blob_reference/hashed_cacheable_reference.rs	98.36%	2 Missing ⚠️
plt/plt-block-state/src/block_state/lfmb_tree.rs	93.54%	2 Missing ⚠️
...ate/src/block_state/state/protocol_level_tokens.rs	85.71%	1 Missing ⚠️

Additional details and impacted files

@@                     Coverage Diff                      @@
##           feature/rust_block_state    #1620      +/-   ##
============================================================
- Coverage                     63.88%   63.87%   -0.02%     
============================================================
  Files                           356      356              
  Lines                         71251    71196      -55     
  Branches                       3032     3032              
============================================================
- Hits                          45519    45474      -45     
+ Misses                        22700    22690      -10     
  Partials                       3032     3032              

Files with missing lines	Coverage Δ
plt/plt-block-state/src/block_state/utils.rs	100.00% <ø> (ø)
...ate/src/block_state/state/protocol_level_tokens.rs	86.55% <85.71%> (-0.49%)	⬇️
...state/blob_reference/hashed_cacheable_reference.rs	98.02% <98.36%> (+4.33%)	⬆️
plt/plt-block-state/src/block_state/lfmb_tree.rs	92.25% <93.54%> (-0.33%)	⬇️

... and 3 files with indirect coverage changes