[Feature-Request] Support language_version specification in Move.toml

[vineethk]

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🐛 Feature Request

In Move.toml, we can specify language versions without any error:

[build]
language_version = "2.2.0"

But this does not seem to be hooked up to the compiler. For example, with the above content, if you have a program with function values, then you get an error saying not supported in this language version.

The ask is to support this modality of specifying the language version for compilation.