feat(LocallyNameless/Untyped): add FullEta.steps_lc_l - #734
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- Introduce `FullEta.steps_lc_l` lemma: if `M ↠ηᶠ M'` and `LC M'`, then `LC M` - Add `@[scoped grind →]` attribute to `step_lc_l`
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FullEta.steps_lc_llemma: ifM ↠ηᶠ M'andLC M', thenLC M@[scoped grind →]attribute tostep_lc_l