Feat: multiple turn chat

[waziers]

Added

• Multi-turn chat experience with:
  • summarization requests
  • multiple turns for updating an existing explore
  • refine the question asked to gemini
  • conversation with markdown support
• Example loader for generation and refinement examples
• Extension app loads examples on the main page to speed up querying

[LukaFontanilla]

@waziers, great addition! Very excited for these capabilities. Added a commit that includes the following:

• EveryonKeyDown event handler now checks for "enter" AND checks for a specific key code. The specific key code check is for other languages like Japanese, where users typically get auto suggested Kanji characters while typing and hitting enter would select those and bring it into the text... which otherwise would mean an immediate submit that is not intended.
• The optional example prompt dataset variable is brought into the .env_example file and the docs mention this as a way to specify an alternative dataset OR alternative dataset and GCP project
• Entitlements added for run_query & create_query for the summary addition

[LukaFontanilla]

Latest commit details:

• uses gemini-pro for BQML instead of gemini-1.0-pro-001
• escapes `` in model id (in case project id is added)
• adds prompt example BQ connection env variables to .env example in readme
• updates explore url gen prompt to use explicit instructions to remove hallucinations