feat: Create broker for negotiating connections (#14)

* feat: Create broker for negotiating connections

WebRTC require an exchange of encryption keys and network hops to connect. This package pipes the exchange over gRPC. This will be used in all connecting clients and agents.

* Regenerate protobuf definition

* Cache Go build and test

* Fix gRPC language with dRPC

Co-authored-by: Bryan <bryan@coder.com>

Co-authored-by: Bryan <bryan@coder.com>

.github/workflows/coder.yaml

@@ -113,6 +113,18 @@ jobs:
         with:
           go-version: "^1.17"
 
+      - uses: actions/cache@v2
+        with:
+          # Go mod cache, Linux build cache, Mac build cache, Windows build cache
+          path: |
+            ~/go/pkg/mod
+            ~/.cache/go-build
+            ~/Library/Caches/go-build
+            %LocalAppData%\go-build
+          key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
+          restore-keys: |
+            ${{ runner.os }}-go-
+
       - run: go install gotest.tools/gotestsum@latest
 
       - run: