feat: mark components built with wash as experimental

[vados-cosmonic]

Feature or Problem

As the component model and WASI are still maturing, the components-first codebases built with wash should reflect the experimental nature of support to related tooling.

This commit marks both components as experimental at two levels -- a custom section in the Wasm metadata (as a custom section) and as a tag on the signed wasmCloud actor that is produced.

Related Issues

Release Information

Consumer Impact

Testing

Built on platform(s)

• [x] x86_64-linux
• [ ] aarch64-linux
• [ ] x86_64-darwin
• [ ] aarch64-darwin
• [ ] x86_64-windows

Tested on platform(s)

• [x] x86_64-linux
• [ ] aarch64-linux
• [ ] x86_64-darwin
• [ ] aarch64-darwin
• [ ] x86_64-windows

Unit Test(s)

Acceptance or Integration

Manual Verification

[vados-cosmonic]

@connorsmith256 thanks for the review, changes are in if you'd like to take a look!