Migrate json-rpc-middleware-stream to Yarn v3

[mikesposito]

The json-rpc-middleware-stream package (https://github.com/MetaMask/json-rpc-middleware-stream) should be migrated to Yarn v3, to match our module template.

From MetaMask/eth-ledger-bridge-keyring#165:

• Run yarn set version stable to install Yarn v3.
• Copy .yarnrc.yml and .yarn/plugins from the module template.
• Run yarn install to generate a new version of yarn.lock.
• As our Yarn v3 assumes that @lavamoat/allow-scripts is installed, we will want to add that as a development dependency. In addition, we will want to add a lavamoat section to package.json. Again, see the module template for the correct version of allow-scripts to use as well as where the new lavamoat section should go.

Similar PRs:

• Yarn v3 eth-trezor-keyring#150
• Migrate from Yarn v1 to Yarn v3 #846
• Update to yarn v3 eth-ledger-bridge-keyring#170