gRPC proxy

[tzdybal]

Overview

gRPC proxy allows developers to easily use DA interface over gRPC connection.
This PR also partially addresses #6 by refactoring test suite. Proxy client/server test shows how easy it is to reuse the test suite.

Resolves #5.

Checklist

• New and updated code has appropriate documentation
• New and updated code has new and/or updated testing
• Required CI checks are passing
• Visual proof for any user facing features like CLI or documentation updates
• Linked issues closed with keywords

[codecov]

Codecov Report

Attention: 26 lines in your changes are missing coverage. Please review.

Comparison is base (6bd21b7) 0.00% compared to head (fd059e7) 84.04%.

Additional details and impacted files

@@            Coverage Diff            @@
##           main      #14       +/-   ##
=========================================
+ Coverage      0   84.04%   +84.04%     
=========================================
  Files         0        3        +3     
  Lines         0      163      +163     
=========================================
+ Hits          0      137      +137     
- Misses        0       18       +18     
- Partials      0        8        +8     

Files	Coverage Δ
proxy/util.go	100.00% <100.00%> (ø)
proxy/server.go	76.47% <76.47%> (ø)
proxy/client.go	78.12% <78.12%> (ø)

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[tuxcanfly]

OK.

[Manav-Aggarwal]

LGTM

[nashqueue]

utAck