fix devcontainer to be ready for development

[serbrech]

DevContainer

The current DevContainer is outdated and when starting a codespace, you need to install a newer node, npm, typespec, etc...

This PR changes the devcontainer configuration so that the codespace is properly configured to start editing the specs.

• use mcr.microsoft.com/devcontainers/typescript-node:20-bookworm as the base image
• install packages-microsoft-prod.deb
• install git
• install npm oav

on environment start:

• install npm packages from packages.json (typespec compiler amongst other)
• set the node_modules/.bin folder to the path, so we can call tsp

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[mikeharder]

set the node_modules/.bin folder to the path, so we can call tsp

Better to get into the habit of running npx tsp, or if you really want, just install the matching version of tsp globally.