servo: Merge #20320 - feat(capture_webrender): write webrender revisi…

…on into text (from kwonoj:feat-wr-revision); r=jdm

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Relates to servo/servo#20315 (comment).

This PR try to generate `wr.txt` when trigger webrender capture. By reading gecko's implementation at [here](https://github.com/mozilla/gecko-dev/blob/3b8e63c66ae1989cfc2c7fb48ca9e025a3828e74/gfx/doc/README.webrender#L53), it seems gecko's build script generates txt file for containing revision of webrender and read it each time trigger capturing.

In this PR tries to similar in cruxwise with small differences:
- `cargo build` reads `cargo.lock`, export it into `${OUT_DIR}/`, included via macro in build time.
- when capturing triggered, those revision will be written as `wr.txt`.

Probably point of discussion & need to be updated in PR if necessary:
~- Is it acceptable `mach` generates module file on build bootstrapping? Should there be other recommendation?~ Now cargo build takes care of generation.

---
<!-- Thank you for contributing to Servo! Please replace each `[ ]` by `[X]` when the step is complete, and replace `__` with appropriate data: -->
- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [x] These changes fix #20295 (github issue number if applicable).

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- [ ] There are tests for these changes OR
- [ ] These changes do not require tests because _____

- This PR manually verified on local mac OS machine.

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Source-Repo: https://github.com/servo/servo
Source-Revision: 91398cf559ddeec8974e04b0a92e464669436177

UltraBlame original commit: cf3b8e9c9c2a290b09376c5e2b720fe1124eeacb

servo/components/compositing/Cargo.toml

@@ -37,6 +37,13 @@ MPL
 publish
 =
 false
+build
+=
+"
+build
+.
+rs
+"
 [
 lib
 ]
@@ -282,3 +289,17 @@ ipc
 "
 ]
 }
+[
+build
+-
+dependencies
+]
+toml
+=
+"
+0
+.
+4
+.
+5
+"