Moved the SHA, AES, and ECJPAKE alt headers and source files into the Matter
repository. Fixed an issue with the semantics of SHA256 context cloning.
Changed the CHIPCryptoPALmbedTLS.cpp implementation to clone the temporary
context back over the original context when done with the non-final
finalization. Increased the SHA context opaque size in CHIPCryptoPAL.h to fit
the TI driver accelerated SHA context.

In future commits it may be possible to share a single SHA driver instance
between all the contexts in mbedtls. This has the disadvantage of requiring a
mutex for driver usage and reference counting. This would also increase
processing time due to the thrashing of the internal digest buffer. But has the
potential advantage that the SHA context can be copied directly with a memcpy.