Fixes:
* Types in binary unions as per [PEP
604](https://peps.python.org/pep-0604/) not highlighted;
* `except*` keyword not highlighted;
* Classes beginning with `_` not recognized as such, however `_` is a
valid first character for private classes; additionally the regex for
parsing constant/class names appeared inconsistent and incomplete so was
adjusted;
* Builtin types such as `float`, `dict`, etc not recognized as types;
* **Update:** decorators with arguments not recognized as decorators;
* **Update:** docstrings after type alias assignments not recognized as
docstrings;
* **Update:** `and/in/is/not/or/is not/not in` not capturable as
keywords;
* **Update:** decorators with "nesting" (@x.y.z) not recognized as
decorators;
Before:

After:

Release Notes:
- N/A
---------
Co-authored-by: Piotr Osiewicz <24362066+osiewicz@users.noreply.github.com>
[PEP484](https://peps.python.org/pep-0484/) defines "Forward references"
for undefined types. This PR treats such annotations as types rather
than strings.
Release Notes:
- Added Python syntax highlighting for forward references.
Release Notes:
- Differentiate between function and method calls and definitions.
`function.definition` matches the highlight for e.g. rust,
`function.call` is new.
- Likewise differentiate between class calls and class definitions.
- Better highlighting of function decorators (the `@` symbol is
punctuation, and now the decorator itself has a `function.decorator`
tag)
- Make `cls` a special variable (like `self`)
- Add `ellipsis` as a built-in constant
Note that most themes do not currently make use of the
`function.definition` tags, and none make use of the
`type.class.definition` tag. Hopefully more themes will pick this up.
*Before:*
<img width="248" alt="image"
src="https://github.com/user-attachments/assets/550ccd3d-594c-413a-b543-ef9caf39eee1">
*After:*
<img width="245" alt="image"
src="https://github.com/user-attachments/assets/47aa43b1-006b-4f9f-9029-510880f390ea">
Closes#18722
- Replace the `@escape` capture name with `@string.escape` for escape
sequences in Go, Python, Regex, Racket, Ruby, and Scheme.
- Rust
- Add syntax highlighting for escape sequences. Close#18722
- Fix the issue where `@punctuation.delimiter` is being overwritten by
`@operator`.
- Add the period (".") to `@punctuation.delimiter`.
Release Notes:
- N/A
- Moves languages module from `zed` into a separate crate. That way we
have less of a long pole at the end of compilation.
- Removes moot dependencies on editor/picker. This is totally harmless
and might help in the future if we decide to decouple picker from
editor.
Before:
```
Number of crates that depend on 'picker' but not on 'editor': 1
Total number of crates that depend on 'picker': 13
Total number of crates that depend on 'editor': 30
```
After:
```
Number of crates that depend on 'picker' but not on 'editor': 5
Total number of crates that depend on 'picker': 12
Total number of crates that depend on 'editor': 26
```
The more crates depend on just picker but not editor, the better in that
case.
Release Notes:
- N/A