build: switch from rollup and terser to esbuild for creating contract bundle (angular#55705)

This commit implements the replacement of rollup and terser with esbuild for generating the contract_bundle binary. The transition is facilitated by optimizations aimed at reducing the bundle size.

PR Close angular#55705

Author: alan-agius4

packages/core/BUILD.bazel

@@ -148,5 +148,5 @@ genrule(
     name = "event_dispatch_contract_binary",
     srcs = ["//packages/core/primitives/event-dispatch:contract_bundle_min"],
     outs = ["event-dispatch-contract.min.js"],
-    cmd = "cat $< >> $@",
+    cmd = "cp $< $@",
 )

packages/core/primitives/event-dispatch/BUILD.bazel

@@ -1,6 +1,4 @@
-load("//tools:defaults.bzl", "ts_library", "tsec_test")
-load("@npm//@bazel/rollup:index.bzl", "rollup_bundle")
-load("@npm//@bazel/terser:index.bzl", "terser_minified")
+load("//tools:defaults.bzl", "esbuild", "ts_library", "tsec_test")
 
 package(default_visibility = ["//visibility:public"])
 
@@ -29,17 +27,18 @@ filegroup(
     visibility = ["//visibility:public"],
 )
 
-rollup_bundle(
-    name = "contract_bundle",
-    args = ["--no-sourcemap"],
+esbuild(
+    name = "contract_bundle_min",
+    args = {
+        "sourcemap": False,
+        "resolveExtensions": [
+            ".mjs",
+        ],
+        "legalComments": "none",
+    },
     entry_point = ":contract_binary.ts",
     format = "iife",
+    minify = True,
+    sourcemap = "inline",
     deps = [":event-dispatch"],
 )
-
-terser_minified(
-    name = "contract_bundle_min",
-    src = ":contract_bundle",
-    config_file = ":terser.config.json",
-    sourcemap = False,
-)