Show inline previews for LSP document colors (#32816)

https://github.com/user-attachments/assets/ad0fa304-e4fb-4598-877d-c02141f35d6f

Closes https://github.com/zed-industries/zed/issues/4678

Also adds the code to support `textDocument/colorPresentation`
counterpart that serves as a resolve mechanism for the document colors.
The resolve itself is not run though, and the editor does not
accommodate color presentations in the editor yet — until a well
described use case is provided.

Use `lsp_document_colors` editor settings to alter the presentation and
turn the feature off.

Release Notes:

- Start showing inline previews for LSP document colors

crates/language/src/proto.rs

@@ -11,6 +11,8 @@ use text::*;
 
 pub use proto::{BufferState, File, Operation};
 
+use super::{point_from_lsp, point_to_lsp};
+
 /// Deserializes a `[text::LineEnding]` from the RPC representation.
 pub fn deserialize_line_ending(message: proto::LineEnding) -> text::LineEnding {
     match message {
@@ -582,3 +584,33 @@ pub fn serialize_version(version: &clock::Global) -> Vec<proto::VectorClockEntry
         })
         .collect()
 }
+
+pub fn serialize_lsp_edit(edit: lsp::TextEdit) -> proto::TextEdit {
+    let start = point_from_lsp(edit.range.start).0;
+    let end = point_from_lsp(edit.range.end).0;
+    proto::TextEdit {
+        new_text: edit.new_text,
+        lsp_range_start: Some(proto::PointUtf16 {
+            row: start.row,
+            column: start.column,
+        }),
+        lsp_range_end: Some(proto::PointUtf16 {
+            row: end.row,
+            column: end.column,
+        }),
+    }
+}
+
+pub fn deserialize_lsp_edit(edit: proto::TextEdit) -> Option<lsp::TextEdit> {
+    let start = edit.lsp_range_start?;
+    let start = PointUtf16::new(start.row, start.column);
+    let end = edit.lsp_range_end?;
+    let end = PointUtf16::new(end.row, end.column);
+    Some(lsp::TextEdit {
+        range: lsp::Range {
+            start: point_to_lsp(start),
+            end: point_to_lsp(end),
+        },
+        new_text: edit.new_text,
+    })
+}