feat(webui): add tiers to picodata http-server

1. http-server:

   1. Get info about tiers from _pico_tier
   2. Get info about instance addresses from:
      • http: lua api
      • binary: _pico_peer_addresses
   3. Switch from arrays to map where it makes sense
   4. Compose all the data to cluster_state object
   5. Get version information for lua api.

2. Tests:

   1. Add DeepDiff package to better diff for json
   2. Amend tests to new specification
   3. Get picodata version via lua api and use it in asserts

3. Chore:

   1. Add .envrc and .direnv to .gitingore (direnv specific files)
   2. Add .vscode to .gitignore.

Signed-off-by: Anatoly Popov a.popov@picodata.io