feat(cache/unstable): add maxSize to TtlCache

[tomas-zijdemans]

• Adds optional maxSize option to TtlCache that evicts the oldest entry (by insertion order) when capacity is exceeded
• Adds maxSize getter (returns Infinity when unset)
• Adds #ejecting re-entrancy guard on set(), delete(), and clear() during onEject callbacks, matching LruCache

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.42%. Comparing base (1cd63ca) to head (7157291).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #7072   +/-   ##
=======================================
  Coverage   94.41%   94.42%           
=======================================
  Files         630      630           
  Lines       50490    50530   +40     
  Branches     8949     8963   +14     
=======================================
+ Hits        47669    47711   +42     
  Misses       2249     2249           
+ Partials      572      570    -2     

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