refactor: replace Reference std::sync::RwLock with parking_lot::RwLock

[brianheineman]

No description provided.

[github-actions]

Bencher Report

Branch	update-reference-rwlock
Testbed	Linux

⚠️ WARNING: No Threshold found!

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Benchmark	Latency	nanoseconds (ns)
default_class_loader	📈 view plot ⚠️ NO THRESHOLD	6,627,800.00 ns
from_bytes	📈 view plot ⚠️ NO THRESHOLD	32,175.00 ns
hello_world	📈 view plot ⚠️ NO THRESHOLD	178,500,000.00 ns
load_hash_map	📈 view plot ⚠️ NO THRESHOLD	479.04 ns
load_invalid_class	📈 view plot ⚠️ NO THRESHOLD	28,929.00 ns
to_bytes	📈 view plot ⚠️ NO THRESHOLD	18,052.00 ns
to_string	📈 view plot ⚠️ NO THRESHOLD	123,420.00 ns
verify	📈 view plot ⚠️ NO THRESHOLD	804.05 ns
vm_init	📈 view plot ⚠️ NO THRESHOLD	170,090,000.00 ns

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[codecov]

Codecov Report

❌ Patch coverage is 74.85030% with 42 lines in your changes missing coverage. Please review.
✅ Project coverage is 94.14%. Comparing base (347c566) to head (2565c41).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
...m/src/intrinsic_methods/java/lang/reflect/array.rs	46.15%	21 Missing ⚠️
.../src/intrinsic_methods/jdk/internal/misc/unsafe.rs	30.00%	14 Missing ⚠️
...c/intrinsic_methods/java/lang/processhandleimpl.rs	0.00%	3 Missing ⚠️
ristretto_classloader/src/object.rs	60.00%	2 Missing ⚠️
...c/intrinsic_methods/java/lang/stacktraceelement.rs	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #538      +/-   ##
==========================================
+ Coverage   94.00%   94.14%   +0.14%     
==========================================
  Files         581      581              
  Lines       59375    59071     -304     
==========================================
- Hits        55813    55610     -203     
+ Misses       3562     3461     -101     

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