Revert "Revert "language: Remove buffer fingerprinting (#9007)"" (#9671)

This reverts commit caed275fbf.

NOTE: this should not be merged until #9668 is on stable and the
`ZedVersion#can_collaborate` is updated to exclude all clients without
that change.

Release Notes:

- N/A

---------

Co-authored-by: Piotr Osiewicz <24362066+osiewicz@users.noreply.github.com>

crates/language/src/proto.rs

@@ -10,11 +10,6 @@ use text::*;
 
 pub use proto::{BufferState, Operation};
 
-/// Serializes a [`RopeFingerprint`] to be sent over RPC.
-pub fn serialize_fingerprint(fingerprint: RopeFingerprint) -> String {
-    fingerprint.to_hex()
-}
-
 /// Deserializes a `[text::LineEnding]` from the RPC representation.
 pub fn deserialize_line_ending(message: proto::LineEnding) -> text::LineEnding {
     match message {