gonzedge / rambling-trie / #330

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Add rbs types and corresponding lint check (#57)

First:

- Add `rbs` gem and all `rbs` types in `sig/` directory
- Add `steep` gem for easier rbs type checking, with basic configuration
only checking `lib` for now
- Add `rubyzip` types as they are not defined

Then:

- Add `|| raise` for places where we expect to always have a value, but
that rbs/steep are not smart enough to autodetect
- Add `EMPTY_ENUMERATOR` to be returned when there is no iteration to
perform
- Add `_Nilable` interface to allow for `nil?` check on generic type for
`ProviderCollection#contains?`
- Expand `ProviderCollection#resolve` to `key?` check to prevent
rbs/steep from complaining about `Cannot have body method`
- Add `children_match_prefix` `partial_word_chars?` `word_chars?`
`closest_node` private abstract methods to `Nodes::Node`, so that both
`Nodes::Raw` and `Nodes::Compressed` have it without duplication
- Make `yardoc` match `rbs` types

Finally:

- Rename `char_symbols` to `reversed_char_symbols` for clarity
- Rename `Nodes::Raw#add`'s param `chars` to `reversed_chars` for
clarity
- Add `lint-rbs-steep` action
- Rename `lint` => `lint-rubocop`
- Bump lint and coverage ruby versions to `3.3.6`

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