code generator improvements

[tanmaykm]

updates to code generator to

• allow additional include directories to be specified during code generation, which will be passed on to protoc.
• handle . in package name

[codecov-commenter]

Codecov Report

Merging #11 (8d3cd75) into main (f8f2f68) will decrease coverage by 0.31%.
The diff coverage is 77.77%.

@@            Coverage Diff             @@
##             main      #11      +/-   ##
==========================================
- Coverage   95.57%   95.25%   -0.32%     
==========================================
  Files           5        5              
  Lines         271      274       +3     
==========================================
+ Hits          259      261       +2     
- Misses         12       13       +1     

Impacted Files	Coverage Δ
src/generate.jl	93.65% <77.77%> (-1.35%)	⬇️

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