This PR implements the `#grind_lint` command, a diagnostic tool for
analyzing the behavior of theorems annotated for theorem instantiation.
The command helps identify problematic theorems that produce excessive
or unbounded instance generation during E-matching, which can lead to
performance issues.
The main entry point is:
```
#grind_lint check
```
which analyzes all theorems marked with the `@[grind]` attribute.
For each theorem, it creates an artificial goal and runs `grind`,
collecting statistics about the number of instances produced.
Results are summarized using info messages, and detailed breakdowns are
shown for lemmas exceeding a configurable threshold.
Additional subcommands are provided for targeted inspection and control:
* `#grind_lint inspect thm`: analyzes one or more specific theorems in
detail
* `#grind_lint mute thm`: excludes a theorem from instantiation during
analysis
* `#grind_lint skip thm`: omits a theorem from being analyzed by
`#grind_lint check`
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