doc/telemetry: add exported events schema (#57106)

This adds a generated markdown reference that can serve as a source-of-truth for exactly what data we do and don't export from Sourcegraph instances.

Table output is a little funky, unless pseudomuto/protoc-gen-doc#520 gets landed one day (for that new `br` template function)

---------

Co-authored-by: William Bezuidenhout <william.bezuidenhout@sourcegraph.com>

WORKSPACE

@@ -58,6 +58,13 @@ http_archive(
     ],
 )
 
+http_archive(
+    name = "rules_proto_grpc",
+    sha256 = "9ba7299c5eb6ec45b6b9a0ceb9916d0ab96789ac8218269322f0124c0c0d24e2",
+    strip_prefix = "rules_proto_grpc-4.5.0",
+    urls = ["https://github.com/rules-proto-grpc/rules_proto_grpc/releases/download/4.5.0/rules_proto_grpc-4.5.0.tar.gz"],
+)
+
 http_archive(
     name = "rules_buf",
     sha256 = "523a4e06f0746661e092d083757263a249fedca535bd6dd819a8c50de074731a",
@@ -241,23 +248,32 @@ load("@webpack//:npm_repositories.bzl", webpack_npm_repositories = "npm_reposito
 webpack_npm_repositories()
 
 # Go toolchain setup
+load("@rules_proto_grpc//:repositories.bzl", "rules_proto_grpc_repos", "rules_proto_grpc_toolchains")
 
-load("@rules_buf//buf:repositories.bzl", "rules_buf_dependencies", "rules_buf_toolchains")
-
-rules_buf_dependencies()
+rules_proto_grpc_toolchains()
 
-rules_buf_toolchains(version = "v1.11.0")
+rules_proto_grpc_repos()
 
-load("@rules_buf//gazelle/buf:repositories.bzl", "gazelle_buf_dependencies")
+load("@rules_proto_grpc//doc:repositories.bzl", rules_proto_grpc_doc_repos = "doc_repos")
 
-gazelle_buf_dependencies()
+rules_proto_grpc_doc_repos()
 
 load("@rules_proto//proto:repositories.bzl", "rules_proto_dependencies", "rules_proto_toolchains")
 
 rules_proto_dependencies()
 
 rules_proto_toolchains()
 
+load("@rules_buf//buf:repositories.bzl", "rules_buf_dependencies", "rules_buf_toolchains")
+
+rules_buf_dependencies()
+
+rules_buf_toolchains(version = "v1.11.0")
+
+load("@rules_buf//gazelle/buf:repositories.bzl", "gazelle_buf_dependencies")
+
+gazelle_buf_dependencies()
+
 load("@io_bazel_rules_go//go:deps.bzl", "go_register_toolchains", "go_rules_dependencies")
 load("@bazel_gazelle//:deps.bzl", "gazelle_dependencies", "go_repository")
 load("//:linter_deps.bzl", "linter_dependencies")