[feature]: add simple rpc

[tac0turtle]

This pr adds the light weight RPC to the node

closes #2027
closes #2118

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[codecov]

Codecov Report

Attention: Patch coverage is 13.38251% with 822 lines in your changes missing coverage. Please review.

Project coverage is 33.92%. Comparing base (2262207) to head (b8f0add).
Report is 25 commits behind head on feature/exec_api.

Files with missing lines	Patch %	Lines
types/pb/rollkit/v1/rollkit.pb.go	0.00%	251 Missing ⚠️
types/pb/rollkit/v1/rpc.pb.go	0.00%	215 Missing ⚠️
types/pb/rollkit/v1/state.pb.go	0.00%	71 Missing ⚠️
pkg/rpc/example/example.go	0.00%	67 Missing ⚠️
types/pb/rollkit/v1/v1connect/rpc.connect.go	0.00%	65 Missing ⚠️
types/pb/rollkit/v1/batch.pb.go	0.00%	49 Missing ⚠️
node/light.go	0.00%	35 Missing ⚠️
pkg/rpc/server/server.go	60.75%	27 Missing and 4 partials ⚠️
pkg/rpc/client/client.go	76.92%	8 Missing and 4 partials ⚠️
test/mocks/Store.go	0.00%	12 Missing ⚠️
... and 5 more

Additional details and impacted files

@@                 Coverage Diff                  @@
##           feature/exec_api    #2122      +/-   ##
====================================================
+ Coverage             24.11%   33.92%   +9.81%     
====================================================
  Files                    52       56       +4     
  Lines                  8231     5677    -2554     
====================================================
- Hits                   1985     1926      -59     
+ Misses                 6089     3574    -2515     
- Partials                157      177      +20     

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[tac0turtle]

buf check will fail until we merge the feature/exec_api into main.