Introduce cross-platform file-watching (#6855)

This adds cross-platform file-watching via the
[Notify](https://github.com/notify-rs/notify) crate. The previous
fs-events implementation is now only used on MacOS, and on other
platforms Notify is used. The watching function interface is the same.

Related to #5391 #5395 #5394.

Release Notes:

- N/A

Cargo.lock

@@ -2737,6 +2737,7 @@ dependencies = [
  "lazy_static",
  "libc",
  "log",
+ "notify",
  "parking_lot 0.11.2",
  "regex",
  "rope",
@@ -2756,7 +2757,7 @@ name = "fsevent"
 version = "2.0.2"
 dependencies = [
  "bitflags 1.3.2",
- "fsevent-sys",
+ "fsevent-sys 3.1.0",
  "parking_lot 0.11.2",
  "tempfile",
 ]
@@ -2770,6 +2771,15 @@ dependencies = [
  "libc",
 ]
 
+[[package]]
+name = "fsevent-sys"
+version = "4.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "76ee7a02da4d231650c7cea31349b889be2f45ddb3ef3032d2ec8185f6313fd2"
+dependencies = [
+ "libc",
+]
+
 [[package]]
 name = "fuchsia-zircon"
 version = "0.3.3"
@@ -3509,6 +3519,26 @@ dependencies = [
  "syn 2.0.48",
 ]
 
+[[package]]
+name = "inotify"
+version = "0.9.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f8069d3ec154eb856955c1c0fbffefbf5f3c40a104ec912d4797314c1801abff"
+dependencies = [
+ "bitflags 1.3.2",
+ "inotify-sys",
+ "libc",
+]
+
+[[package]]
+name = "inotify-sys"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e05c02b5e89bff3b946cedeca278abc628fe811e604f027c45a8aa3cf793d0eb"
+dependencies = [
+ "libc",
+]
+
 [[package]]
 name = "install_cli"
 version = "0.1.0"
@@ -3726,6 +3756,26 @@ dependencies = [
  "winapi-build",
 ]
 
+[[package]]
+name = "kqueue"
+version = "1.0.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7447f1ca1b7b563588a205fe93dea8df60fd981423a768bc1c0ded35ed147d0c"
+dependencies = [
+ "kqueue-sys",
+ "libc",
+]
+
+[[package]]
+name = "kqueue-sys"
+version = "1.0.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ed9625ffda8729b85e45cf04090035ac368927b8cebc34898e7c120f52e4838b"
+dependencies = [
+ "bitflags 1.3.2",
+ "libc",
+]
+
 [[package]]
 name = "kurbo"
 version = "0.8.3"
@@ -4281,6 +4331,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "927a765cd3fc26206e66b296465fa9d3e5ab003e651c1b3c060e7956d96b19d2"
 dependencies = [
  "libc",
+ "log",
  "wasi 0.11.0+wasi-snapshot-preview1",
  "windows-sys 0.48.0",
 ]
@@ -4534,6 +4585,25 @@ dependencies = [
  "util",
 ]
 
+[[package]]
+name = "notify"
+version = "6.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6205bd8bb1e454ad2e27422015fb5e4f2bcc7e08fa8f27058670d208324a4d2d"
+dependencies = [
+ "bitflags 2.4.1",
+ "crossbeam-channel",
+ "filetime",
+ "fsevent-sys 4.1.0",
+ "inotify",
+ "kqueue",
+ "libc",
+ "log",
+ "mio 0.8.8",
+ "walkdir",
+ "windows-sys 0.48.0",
+]
+
 [[package]]
 name = "ntapi"
 version = "0.3.7"