Skip the bootstrap

Currently the extension performs a Cake bootstrap every time a workspace containing a cake file is opened. I couldn't find a way to disable that behavior.

I use a custom bootstrapper script that sets environment variables such as `CAKE_PATHS_TOOLS` and `CAKE_PATHS_ADDINS` with custom paths. I have lots of cake files that use the same tools and addins, so I want those to be shared in a single place.

When opening a workspace in VS Code, the extension is not aware of this, and ends up creating a `tools` directory in each workspace, even if I don't open a cake file in the editor.

I'd like a way to improve upon this. Here are some ideas:
- A setting that would let me disable the bootstrap
- Perform a bootstrap only when a cake file is opened in the editor
- A setting that would let me configure the tools/addins/modules directories

Start by tracing the extension's bootstrap behavior when a VS Code workspace containing a Cake file opens. Compare the proposed options—disabling bootstrap, waiting for an editor-open event, or configuring tools/addins/modules paths—and confirm the intended behavior with maintainers before identifying the relevant implementation and tests.

Written by the indexing model from the issue text.