49f4c7f0699e5e19ac6e41ef5b607392dd7a2983 tests: Add fuzzing harness for various PSBT related functions (practicalswift)
Pull request description:
Add fuzzing harness for various PSBT related functions. **Testing this PR** Run: ``` $ CC=clang CXX=clang++ ./configure --enable-fuzz \ --with-sanitizers=address,fuzzer,undefined $ make $ src/test/fuzz/psbt ```
Backport of Core PR17136