Support table function

[wangfenjin]

• Support table function
• and impl excel as an example

close #102

[codecov]

Codecov Report

Merging #138 (b0e95cf) into main (d231b27) will decrease coverage by 0.73%.
The diff coverage is 54.91%.

@@            Coverage Diff             @@
##             main     #138      +/-   ##
==========================================
- Coverage   59.41%   58.68%   -0.73%     
==========================================
  Files          26       33       +7     
  Lines        1481     1847     +366     
==========================================
+ Hits          880     1084     +204     
- Misses        601      763     +162     

Impacted Files	Coverage Δ
src/lib.rs	77.08% <0.00%> (+2.34%)	⬆️
src/vtab/logical_type.rs	20.28% <20.28%> (ø)
src/vtab/vector.rs	26.56% <26.56%> (ø)
src/vtab/function.rs	55.07% <55.07%> (ø)
src/vtab/data_chunk.rs	65.21% <65.21%> (ø)
src/vtab/value.rs	80.00% <80.00%> (ø)
src/vtab/mod.rs	82.97% <82.97%> (ø)
src/vtab/excel.rs	84.33% <84.33%> (ø)

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