Fix schema binding signature in `ToDataTable` implementation

[atifaziz]

This PR fixes the nullable annotations on signatures of internal methods that make up the ToDataTable implementation, such as BuildOrBindSchema and CreateShredder.

[codecov[bot]]

Codecov Report

Merging #1008 (feccd25) into master (f59f7a5) will not change coverage. The diff coverage is 100.00%.

:exclamation: Current head feccd25 differs from pull request most recent head d739f65. Consider uploading reports for the commit d739f65 to get more accurate results

@@           Coverage Diff           @@
##           master    #1008   +/-   ##
=======================================
  Coverage   90.50%   90.50%           
=======================================
  Files         113      113           
  Lines        3422     3422           
  Branches     1055     1055           
=======================================
  Hits         3097     3097           
  Misses        263      263           
  Partials       62       62           

Impacted Files	Coverage Δ
MoreLinq/ToDataTable.cs	96.51% <100.00%> (ø)

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