Persistence API

[Yiling-J]

func (c *Cache[K, V]) SaveCache(version uint64, writer io.Writer) error
func (c *Cache[K, V]) LoadCache(version uint64, reader io.Reader) error 

Use gob internally and persist following:

• Cached data
• CountMinSketch
• Segmented LRU

Record data checksum on Save and do checksum verification on Load

[codecov-commenter]

Codecov Report

Patch coverage: 78.16% and project coverage change: -3.45 ⚠️

Comparison is base (850b817) 95.65% compared to head (4ab3283) 92.20%.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main      #19      +/-   ##
==========================================
- Coverage   95.65%   92.20%   -3.45%     
==========================================
  Files          12       13       +1     
  Lines        1196     1450     +254     
==========================================
+ Hits         1144     1337     +193     
- Misses         36       76      +40     
- Partials       16       37      +21     

Impacted Files	Coverage Δ
internal/list.go	91.93% <71.42%> (-4.19%)	⬇️
internal/store.go	89.61% <72.10%> (-8.86%)	⬇️
internal/persistence.go	90.62% <90.62%> (ø)
cache.go	100.00% <100.00%> (ø)
internal/entry.go	95.06% <100.00%> (+1.51%)	⬆️
internal/sketch.go	96.38% <100.00%> (ø)
internal/timerwheel.go	100.00% <100.00%> (+2.91%)	⬆️

... and 1 file with indirect coverage changes

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