This prepares for the introduction of a non-dependent synonym of FunLike, which helps a lot with keeping #8386 readable.

This is entirely search-and-replace in [680197f](680197f) combined with manual fixes in [4145626](4145626), [e900597](e900597) and [b8428f8](b8428f8). The commands that generated this change:
```bash
sed -i 's/\bFunLike\b/DFunLike/g' {Archive,Counterexamples,Mathlib,test}/**/*.lean
sed -i 's/\btoFunLike\b/toDFunLike/g' {Archive,Counterexamples,Mathlib,test}/**/*.lean
sed -i 's/import Mathlib.Data.DFunLike/import Mathlib.Data.FunLike/g' {Archive,Counterexamples,Mathlib,test}/**/*.lean
sed -i 's/\bHom_FunLike\b/Hom_DFunLike/g' {Archive,Counterexamples,Mathlib,test}/**/*.lean     
sed -i 's/\binstFunLike\b/instDFunLike/g' {Archive,Counterexamples,Mathlib,test}/**/*.lean
sed -i 's/\bfunLike\b/instDFunLike/g' {Archive,Counterexamples,Mathlib,test}/**/*.lean
sed -i 's/\btoo many metavariables to apply `fun_like.has_coe_to_fun`/too many metavariables to apply `DFunLike.hasCoeToFun`/g' {Archive,Counterexamples,Mathlib,test}/**/*.lean
```



Co-authored-by: Anne Baanen <Vierkantor@users.noreply.github.com>

This follows up from #9785, which renamed `FunLike` to `DFunLike`,
by introducing a new abbreviation `FunLike F α β := DFunLike F α (fun _ => β)`,
to make the non-dependent use of `FunLike` easier.

This follows up from #9785, which renamed `FunLike` to `DFunLike`, by introducing a new abbreviation `FunLike F α β := DFunLike F α (fun _ => β)`, to make the non-dependent use of `FunLike` easier.

I searched for the pattern `DFunLike.*fun` and `DFunLike.*λ` in all files to replace expressions of the form `DFunLike F α (fun _ => β)` with `FunLike F α β`. I did this everywhere except for `extends` clauses for two reasons: it would conflict with #8386, and more importantly `extends` must directly refer to a structure with no unfolding of `def`s or `abbrev`s.