[String] Do not cast integer/float-like strings to datetime

[ohaibbq]

Closes #175

[codecov-commenter]

Codecov Report

Merging #184 (635786c) into main (961ce06) will increase coverage by 0.09%.
The diff coverage is n/a.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #184      +/-   ##
==========================================
+ Coverage   46.39%   46.48%   +0.09%     
==========================================
  Files          47       47              
  Lines       17828    17820       -8     
==========================================
+ Hits         8271     8284      +13     
+ Misses       8111     8092      -19     
+ Partials     1446     1444       -2     

[ohaibbq]

This will also require a change in bigquery-emulator repository.go to handle parsing of timestamps when adding table data

[ohaibbq]

The bigquery-emulator change has been merged to our fork here- https://github.com/Recidiviz/bigquery-emulator/pull/7/files

There's conflicts with the upstream repo until goccy/bigquery-emulator#271 is merged.

[goccy]

Thank you for your contribution ! LGTM 👍