analysis: add Bazel toolchain analysis

toolchain-analysis/bazel.md

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+# Bazel toolchain analysis
+
+[Bazel](https://bazel.build/) is an open-source build and test tool similar to
+Make, Maven, and Gradle. It uses a human-readable, high-level build language.
+Bazel supports projects in multiple languages and builds outputs for multiple
+platforms. Bazel supports large codebases across multiple repositories, and
+large numbers of users.
+
+## Supported platforms
+
+TODO: test Bazel against currently Node.js supported platforms and toolchains
+(see [BUILDING.MD](https://github.com/nodejs/node/edit/master/BUILDING.md)).
+
+### Unsupported platforms
+
+TODO: see above
+
+## Pros
+
+* Easier to upgrade V8 as we don't need to rewrite build configs for V8
+* Compared to GN, Bazel is more widely adopted outside Chromium
+
+## Cons
+
+* Other dependencies will need Node.js-maintained GN build files
+* Currently support a limited set of platforms [^1]
+* V8 team can't guarantee Bazel will still be maintained if V8 stops being used
+  at Google outside Chroumium
+
+[^1]: There's a registry of community-maintained build files for popular
+projects. It still doesn't cover several dependenceis that Node.js needs but
+might be a better place to have those files instead of keeping them in Node.js
+itself https://github.com/bazelbuild/bazel-central-registry/blob/main/modules/.
+
+## Known ports
+
+* No known open-source ports
+
+
+## Need more info
+
+* Could V8 use Bazel instead of GN in their CI?
+
+## Observations
+
+*