[C API] NP_GetDims implementation

[vkuzmin-uber]

Summary:

Continue with basic implementation of a C API for Neuropod. Issue #407

Test Plan:

Added test that test returned values of number of dims and data in dims array.

[vkuzmin-uber]

I know linter shown problem and I ran autofix and didn't check it after athat! It means autofix doesn't update C file! Will look on it and update.

[VivekPanyam]

I know linter shown problem and I ran autofix and didn't check it after athat! It means autofix doesn't update C file! Will look on it and update.

The lint script currently fails on the first linter that fails (for example if you have an error in a BUILD file, it won't even look at Python and C++). I think autofix has this behavior as well. On my todo list to fix this :)

For now, I usually just run tools/lint.sh again just to make sure everything is fine.

[codecov]

Codecov Report

Merging #422 into master will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #422      +/-   ##
==========================================
+ Coverage   89.53%   89.54%   +0.01%     
==========================================
  Files          90       90              
  Lines        5199     5205       +6     
==========================================
+ Hits         4655     4661       +6     
  Misses        544      544              

Impacted Files	Coverage Δ
source/neuropod/bindings/c/np_tensor.cc	87.50% <100.00%> (+7.50%)	⬆️

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