feat: upgrade Deno core and extensions (#100)

Upgrade Deno crates to version 2023.03.10:
 - `deno_core` from `0.173.0` to `0.174.0`
 - `deno_runtime` from `0.99.0` to `0.100.0`

Notable changes:

- Rework import of internal modules from `internal:` to `ext:` scheme.

- Rework the initialisation of extensions to load both ops and ESM code 
  since we are not using snapshots yet.

Signed-off-by: Miroslav Bajtoš <[email protected]>