WIP start to hash table API

[k2bd]

Closes #4

[codecov]

Codecov Report

Merging #6 (affbce0) into main (48324fb) will decrease coverage by 8.13%.
The diff coverage is 80.13%.

@@            Coverage Diff             @@
##             main       #6      +/-   ##
==========================================
- Coverage   95.09%   86.96%   -8.13%     
==========================================
  Files          10       13       +3     
  Lines         530     1097     +567     
==========================================
+ Hits          504      954     +450     
- Misses         26      143     +117     

Impacted Files	Coverage Δ
src/dbms/storage/serialize.rs	99.01% <ø> (ø)
src/dbms/storage/page/hash_table/table.rs	73.76% <73.76%> (ø)
src/dbms/storage/page/hash_table/block.rs	87.79% <77.77%> (-3.82%)	⬇️
...c/dbms/storage/page/hash_table/header_extension.rs	95.60% <95.60%> (ø)
src/dbms/storage/page/hash_table/header.rs	94.89% <96.55%> (+0.55%)	⬆️
src/dbms/storage/disk/testing.rs	92.59% <100.00%> (+0.59%)	⬆️
src/dbms/storage/page/hash_table/hash_function.rs	100.00% <100.00%> (ø)
src/dbms/storage/page/hash_table/util.rs	100.00% <100.00%> (ø)

... and 1 file with indirect coverage changes

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