Fix bitvector tests for coq#16748

See merge request iris/stdpp!421

Add some type annotations for prepare for `Hint Mode` for `Equiv`.

See merge request iris/stdpp!418

Added set lemmas about difference and union

See merge request iris/stdpp!386

add map_fold_delete

See merge request iris/stdpp!412

Add lemma `foldr_cons`.

See merge request iris/stdpp!416

Add lemma `lookup_snoc_Some`.

See merge request iris/stdpp!415

Add lemma `filter_app_complement`.

See merge request iris/stdpp!414

add map_choose_or_empty

See merge request iris/stdpp!413

Add bitvector library with automation

See merge request iris/stdpp!408

Prepare changelog for release 1.8

See merge request iris/stdpp!410

Refactor and improve documentation of feed and efeed tactics

See merge request iris/stdpp!403

Refactor feed and add the feed generalize, efeed generalize, efeed inversion, and efeed destruct tactics

Rename plus/minus → add/sub and put number lemmas in modules to be consistent with Coq stdlib

See merge request iris/stdpp!404

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This is similar to the trick we use for `bi` and makes it possible to import
`Nat` and obtain all lemmas---i.e., those from Coq's stdlib + those from std++.

Thanks to @Blaisorblade for the suggestion.