Revert "Add code generator for otel proto (#39)"

This reverts commit 0fd842e.

README.md

@@ -22,8 +22,6 @@ pip install --upgrade pip
 pip install .
 ```
 
-## Development
-
 To develop this package, run
 
 ```bash
@@ -35,9 +33,3 @@ source .venv/bin/activate
 pip install --upgrade pip
 pip install . ./tests/snowflake-telemetry-test-utils
 ```
-
-### Code generation
-
-To regenerate the code under `src/snowflake/_internal/opentelemetry/proto/`, execute the script `./scripts/proto_codegen.sh`. The script expects the `src/snowflake/_internal/opentelemetry/proto/` directory to exist, and will delete all .py files in it before regerating the code.
-
-The commit/branch/tag of [opentelemetry-proto](https://github.com/open-telemetry/opentelemetry-proto) that the code is generated from is pinned to PROTO_REPO_BRANCH_OR_COMMIT, which can be configured in the script. It is currently pinned to the same tag as [opentelemetry-python](https://github.com/open-telemetry/opentelemetry-python/blob/main/scripts/proto_codegen.sh#L15).