feat: add injected client to content script

[0xtsukino]

This PR will inject a client to each tab for dapp to interact with the extension.

const client = await window.tlsn.connect();
const history = await client.getHistory();

// history contains list of metadata from notarization history (method, url, notary url, proxy url)

• add injected client
• add connect flow
• add get history
• add get proof
• add notarize
• add install plugin
• add call plugin