adds support for custom user profiles instead of just the predefined options. Closes #1111.

[Sycrosity]

adds the option to use the --profile (user_defined_profile) flag in wasm-pack build, along with an associated test and manifest edits as a fix for #1111.

However, this required removing the Copy implied trait from BuildProfile, (which doesn't affect code execution)

[FirelightFlagboy]

Hi @Sycrosity, are you still working on this PR ? if not I would like to retake the work on that PR