Containerized Protobuf generation

[alpe]

Resolves #295

This PR contains:

• New docker container: cosmwasm/prototools-docker -> contrib/prototools-docker/Dockerfile
• Support for make proto-gen for generation and make proto-lint for Buf linter
• Better comments in Protobuf files
• Linted protobuf files
• Re-generated Go files
• Generated doc from protobuf -> /doc/proto.md

[codecov]

Codecov Report

Merging #304 (02948d3) into master (4fb3a50) will increase coverage by 0.01%.
The diff coverage is 36.36%.

@@            Coverage Diff             @@
##           master     #304      +/-   ##
==========================================
+ Coverage   17.49%   17.51%   +0.01%     
==========================================
  Files          35       35              
  Lines       10505    10505              
==========================================
+ Hits         1838     1840       +2     
+ Misses       8566     8565       -1     
+ Partials      101      100       -1     

Impacted Files	Coverage Δ
x/wasm/internal/keeper/querier.go	50.37% <ø> (ø)
x/wasm/internal/types/genesis.pb.go	0.66% <ø> (ø)
x/wasm/internal/types/msg.pb.go	0.55% <ø> (ø)
x/wasm/internal/types/proposal.pb.go	0.42% <ø> (ø)
x/wasm/internal/types/query.pb.go	0.71% <0.00%> (ø)
x/wasm/internal/types/query.pb.gw.go	0.00% <0.00%> (ø)
x/wasm/internal/types/types.go	23.76% <0.00%> (ø)
x/wasm/internal/types/types.pb.go	0.76% <ø> (ø)
x/wasm/internal/types/params.go	60.97% <100.00%> (ø)
x/wasm/internal/keeper/keeper.go	90.30% <0.00%> (+0.60%)	⬆️

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[webmaster128]

Nice. Much better maintainable than a one-line .PHONY. Did now know you can specily multiple .PHONY. But people on the internet say this is how you do it (https://stackoverflow.com/questions/4156382/is-it-possible-to-have-multiple-phony-targets-in-a-gnu-makefile)

[webmaster128]

This script is executed by the developer who changes the .proto files and the docs are checked-in along with the proto changes?

[alpe]

yes, generated files are checked into the repo.