Release v4.0.0a3: Hold Your Breath... · nasa/fprime

One last check before PR-4000 (v4.0.0).

What's Changed

Updates Types.fpp to use optimized sizes for enumerations by @kyleajones in #3956
Format Os Module by @thomas-bc in #3959
Format Drv module by @thomas-bc in #3960
Update data types doc by @jwest115 in #3957
Bump GDS to latest release by @aborjigin in #3964
Improve backward compatibility [de]serialize[From/To] fallback on Fw::Serializable and Fw::Buffer by @Kronos3 in #3962
Remove XML dependencies from requirements by @thomas-bc in #3961
Clang 20.1 UT Errors by @m-aleem in #3949
Format Fw and add to CI by @thomas-bc in #3976
Fix/uart bytes by @LeStarch in #3948
Bump fprime-tools version by @LeStarch in #3972
Update Cross Compilation Tutorial by @aborjigin in #3979
Format Svc and add to CI by @thomas-bc in #3978
Rate drive sent/receive telemetry by @LeStarch in #3980
Add DP Demo for testing DPs and fprime-dp-writer by @jwest115 in #3951
CMake documentation refactor by @LeStarch in #3981
Fix F Prime location in LedBlinker CI by @thomas-bc in #3988
Removed sock fd assert on IpSocket by @jsilveira1409 in #3973
Update teardown ordering by @LeStarch in #3990
Differentiate sync/async ByteStreamDriver and update ComStub to work with both by @thomas-bc in #3987
(De)Serialization clean up of temporary workarounds by @vincewoo in #3971
Update to FPP v3.0.0, Tools v4.0.0, and GDS v4.0.0 by @LeStarch in #3995
Generative AI documentation Added by @aborjigin in #3932
Fix HelloWorld CI following update to v4.0 by @thomas-bc in #3997
PR 4000: Bump Tools and GDS by @thomas-bc in #4000

Full Changelog: v4.0.0a2...v4.0.0a3