Add config for ASAN builds.

Enables ASAN builds with e.g. bazel -c opt --config=asan <targets>

Author: smcallis

src/.bazelrc

@@ -1,3 +1,16 @@
 # Enable Bzlmod for every Bazel command
 common --enable_bzlmod
-common --cxxopt=-std=c++20
+common --cxxopt=-std=c++20
+
+# Options to build with address sanitizer support.
+#
+# Example usage:
+#   bazel build -c dbg --config=asan <targets>
+build:asan --strip=never
+build:asan --copt -fsanitize=address
+build:asan --copt -DADDRESS_SANITIZER
+build:asan --copt -D_GLIBCXX_SANITIZE_VECTOR
+build:asan --copt -O1
+build:asan --copt -g
+build:asan --copt -fno-omit-frame-pointer
+build:asan --linkopt -fsanitize=address