Add `integration-server` and simplify `basic-server-{react,vanillajs}`#157

jonathanhefner wants to merge 4 commits intomodelcontextprotocol:mainmodelcontextprotocol/ext-apps:mainfrom

jonathanhefner:add-example-server-for-integration-testingjonathanhefner/mcp-ext-apps:add-example-server-for-integration-testingCopy head branch name to clipboard