auto-fix: grouped auto fixes like Remove all unused parameters

**Is your feature request related to a problem? Please describe.**
VS Code does not offer a way to perform auto fixes in bulk. If the same problem is reported many times, the user must fix click through and fix each item.

**Describe the solution you'd like**
Other static analysis tools offer different types of "fix all" options. For example, the following tooltip would have an additional autofix option, "Remove all unused parameters" just below the existing option.

Some autofixes that would benefit from this include:
- Remove unused parameter
- Remove unused variable
- Remove unused existing resource

Here is an example of the pylint auto-fix for removing an unused import.

In addition to auto-fixes that fix all instances of the same issue, a super "Apply All Fixes" option would also be great.

The issue names VS Code autofixes and examples such as unused parameters, variables, resources, and imports, but it mentions no repository files, tests, or entry points. Begin by locating the VS Code diagnostic and code-action integration, then determine the scope and expected behavior for grouped fixes and an Apply All Fixes action. Done should include agreed behavior and coverage for the requested fix-all options.

Written by the indexing model from the issue text.