Enable look-around in Project Search using fancy-regex crate (#20308)

Closes #13486 

Release Notes:

- Added support for look-around in project search

Co-authored-by: Max <max@zed.dev>

Cargo.lock

@@ -1588,7 +1588,7 @@ dependencies = [
  "bitflags 2.6.0",
  "cexpr",
  "clang-sys",
- "itertools 0.10.5",
+ "itertools 0.12.1",
  "lazy_static",
  "lazycell",
  "proc-macro2",
@@ -1637,6 +1637,15 @@ dependencies = [
  "bit-vec 0.7.0",
 ]
 
+[[package]]
+name = "bit-set"
+version = "0.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "08807e080ed7f9d5433fa9b275196cfc35414f66a0c79d864dc51a0d825231a3"
+dependencies = [
+ "bit-vec 0.8.0",
+]
+
 [[package]]
 name = "bit-vec"
 version = "0.6.3"
@@ -1649,6 +1658,12 @@ version = "0.7.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d2c54ff287cfc0a34f38a6b832ea1bd8e448a330b3e40a50859e6488bee07f22"
 
+[[package]]
+name = "bit-vec"
+version = "0.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5e764a1d40d510daf35e07be9eb06e75770908c27d411ee6c92109c9840eaaf7"
+
 [[package]]
 name = "bit_field"
 version = "0.10.2"
@@ -4248,6 +4263,17 @@ dependencies = [
  "regex",
 ]
 
+[[package]]
+name = "fancy-regex"
+version = "0.14.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6e24cb5a94bcae1e5408b0effca5cd7172ea3c5755049c5f3af4cd283a165298"
+dependencies = [
+ "bit-set 0.8.0",
+ "regex-automata 0.4.7",
+ "regex-syntax 0.8.4",
+]
+
 [[package]]
 name = "fast-srgb8"
 version = "1.0.0"
@@ -9044,6 +9070,7 @@ dependencies = [
  "clock",
  "collections",
  "env_logger 0.11.5",
+ "fancy-regex 0.14.0",
  "fs",
  "futures 0.3.30",
  "fuzzy",
@@ -12394,7 +12421,7 @@ dependencies = [
  "anyhow",
  "base64 0.21.7",
  "bstr",
- "fancy-regex",
+ "fancy-regex 0.12.0",
  "lazy_static",
  "parking_lot",
  "rustc-hash 1.1.0",