Gpt Index and search functionality

What's Changed

• Added search using /search readme will be updated later with a howto
• Added various /index commands, read the readme for how to use it
• Create How to host on Azure app service.md by @falkoro in https://github.com/Kav-K/GPT3Discord/pull/130
• Patch 3 by @falkoro in https://github.com/Kav-K/GPT3Discord/pull/134
• Gpt-index implementation by @Hikari-Haru and @Kav-K in https://github.com/Kav-K/GPT3Discord/pull/128
• Various gpt-index fixes by @Hikari-Haru in https://github.com/Kav-K/GPT3Discord/pull/142

Full Changelog: Kav-K/GPT3Discord@v9.1...V10.1