fix: Return a GRPC.RPCError in mint adapter

[rockneurotiko]

Fixes #544

Gun adapter always returns {:error, %GRPC.RPCError{}} when an error happen while reading data, Mint on the other hand returns {:error, String.t()}, this PR changes the mint adapter to return {:error, %GRPC.RPCError{}} just like the gun adapter

[rockneurotiko]

For the tests (the reason the CI fails), I had to uncomment this locally on the grpc mix.exs to be able to run them:

      {:grpc_server, path: "../grpc_server", only: :test}

Do you want me to uncomment it (or point to ~> 1.0)

[polvalente]

@sleipnir for what it's worth, I think we should consider this a bug and release the fix in 1.0.1

[sleipnir]

@sleipnir for what it's worth, I think we should consider this a bug and release the fix in 1.0.1

I agree

[sleipnir]

For the tests (the reason the CI fails), I had to uncomment this locally on the grpc mix.exs to be able to run them:

      {:grpc_server, path: "../grpc_server", only: :test}

Do you want me to uncomment it (or point to ~> 1.0)

Please uncomment

[rockneurotiko]

For the tests (the reason the CI fails), I had to uncomment this locally on the grpc mix.exs to be able to run them:

      {:grpc_server, path: "../grpc_server", only: :test}

Do you want me to uncomment it (or point to ~> 1.0)

Please uncomment

Done! Doing the deps get also updated the lock, it still had the grpc_core-rc.1

[sleipnir]

Tks @rockneurotiko we will release new version on Hex