[#1474] add release note snippet

Author: schaubh

docs/source/Support/bskReleaseNotesSnippets/build-toolchain-metadata.rst

@@ -0,0 +1,4 @@
+- Added ``Basilisk.getBuildInfo()`` and ``Basilisk.printBuildInfo()`` to report build diagnostics and a compiled,
+  versioned C/C++ ABI descriptor for an installed Basilisk package.  The public descriptor contract is shared with
+  BSK-SDK headers, module-only builds refresh the compiled ABI metadata, and CMake uses the Python interpreter from
+  the environment that invoked the build.