chore: Extract languages from zed crate (#8270)

- 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

crates/editor/src/display_map/block_map.rs

@@ -2,10 +2,11 @@ use super::{
     wrap_map::{self, WrapEdit, WrapPoint, WrapSnapshot},
     Highlights,
 };
-use crate::{Anchor, Editor, EditorStyle, ExcerptId, ExcerptRange, GutterDimensions, ToPoint as _};
+use crate::{EditorStyle, GutterDimensions};
 use collections::{Bound, HashMap, HashSet};
-use gpui::{AnyElement, ElementContext, Pixels, View};
+use gpui::{AnyElement, ElementContext, Pixels};
 use language::{BufferSnapshot, Chunk, Patch, Point};
+use multi_buffer::{Anchor, ExcerptId, ExcerptRange, ToPoint as _};
 use parking_lot::Mutex;
 use std::{
     cell::RefCell,
@@ -85,7 +86,6 @@ pub enum BlockStyle {
 
 pub struct BlockContext<'a, 'b> {
     pub context: &'b mut ElementContext<'a>,
-    pub view: View<Editor>,
     pub anchor_x: Pixels,
     pub max_width: Pixels,
     pub gutter_dimensions: &'b GutterDimensions,