Add a library to sync conda environments (#628)

Summary:
Pull Request resolved: #628

X-link: #628

This adds a crate to do rsync-style syncing of a source conda env to a
destination, as per:

```
$ rsync --archive --update --no-dirtimes --delete --delete-excluded ...
```

As `rsync` (and this crate) uses mtimes for syncing, it'll work even with the
differences in prefixes between source and destination conda envs.

The notable differences with rsync are:
1) In current flows, when users "activate" their conda env locally, prefixes in
    the env will be quickly re-written, changing mtimes to be ahead of the
    destination (e.g. on MAST, the conda env is unpacked into it's expected
    prefix location).  This crate uses the `pack-meta/history.jsonl` file to detect
    prefix update windows and use that to filter out these sprurious mtime updates.
2) Files that are copied perform in-place prefix replacement (TODO: not finished
    yet).

Reviewed By: highker

Differential Revision: D78424481

fbshipit-source-id: 0a433baee8aff90b4b05091d9b3188dd10655b44

Author: andrewjcg

monarch_conda/Cargo.toml

@@ -0,0 +1,37 @@
+# @generated by autocargo from //monarch/monarch_conda:[conda-sync-cli,monarch_conda]
+
+[package]
+name = "monarch_conda"
+version = "0.0.0"
+authors = ["Meta"]
+edition = "2021"
+license = "BSD-3-Clause"
+
+[[bin]]
+name = "conda_sync_cli"
+path = "src/main.rs"
+
+[dependencies]
+anyhow = "1.0.98"
+async-tempfile = "0.7.0"
+bincode = "1.3.3"
+clap = { version = "4.5.42", features = ["derive", "env", "string", "unicode", "wrap_help"] }
+dashmap = { version = "5.5.3", features = ["rayon", "serde"] }
+digest = "0.10"
+filetime = "0.2.25"
+futures = { version = "0.3.31", features = ["async-await", "compat"] }
+globset = { version = "0.4.13", features = ["serde1"] }
+ignore = "0.4"
+itertools = "0.14.0"
+memchr = "2.7.5"
+memmap2 = "0.9.5"
+rattler_conda_types = "0.28.3"
+serde = { version = "1.0.219", features = ["derive", "rc"] }
+serde_json = { version = "1.0.140", features = ["alloc", "float_roundtrip", "raw_value", "unbounded_depth"] }
+sha2 = "0.10.6"
+tokio = { version = "1.46.1", features = ["full", "test-util", "tracing"] }
+tokio-util = { version = "0.7.15", features = ["full"] }
+walkdir = "2.3"
+
+[dev-dependencies]
+tempfile = "3.15"