Re-export basic text types from text and language crates

Also avoid production dependencies on fs and rope in collab

crates/git/src/diff.rs

@@ -1,8 +1,6 @@
 use std::ops::Range;
-
-use rope::point::Point;
 use sum_tree::SumTree;
-use text::{Anchor, BufferSnapshot, OffsetRangeExt};
+use text::{Anchor, BufferSnapshot, OffsetRangeExt, Point};
 
 pub use git2 as libgit;
 use libgit::{DiffLineType as GitDiffLineType, DiffOptions as GitOptions, Patch as GitPatch};