[wasm] Templates initial implementation

[radekdoulik]

Add initial simple WebAssembly templates implementation

• add the templates nuget to the workload
• add tests to exercise the project creation, building and publishing

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Issue Details

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Add initial simple WebAssembly templates implementation

• add the templates nuget to the workload
• add tests to exercise the project creation, building and publishing

Author:	radekdoulik
Assignees:	radekdoulik
Labels:	arch-wasm, area-Build-mono
Milestone:	7.0.0

[ilonatommy]

@radekdoulik, is it looks like fixed with #63683. If I am wrong, please reopen.