[Support/BLAKE3] LLVM-specific changes over the original BLAKE3 C implementation

Changes from original BLAKE3 sources:

* `blake.h`:
    * Changes to avoid conflicts if a client also links with its own BLAKE3 version:
        * Renamed the header macro guard with `LLVM_C_` prefix
        * Renamed the C symbols to add the `llvm_` prefix
    * Added a top header comment that references the CC0 license and points to the `LICENSE` file in the repo.
* `blake3_impl.h`: Added `#define`s to remove some of `llvm_` prefixes for the rest of the internal implementation.
* Implementation files:
    * Added a top header comment for `blake.c`
    * Used `llvm_` prefix for the C public API functions
    * Used `LLVM_LIBRARY_VISIBILITY` for internal implementation functions
    * Added `.private_extern`/`.hidden` in assembly files to reduce visibility of the internal implementation functions
* `README.md`:
    * added a note about where the sources originated from
    * Used the C++ BLAKE3 class and `llvm_` prefixed C API in place of examples and API documentation.
    * Removed instructions about how to build the files.

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