feat: kcl rust plugin impl and example

[Peefy]

1. Does this PR affect any open issues?(Y/N) and add issue references (e.g. "fix #123", "re #123".):

• N
• Y

Related discussion: https://github.com/orgs/kcl-lang/discussions/1587

feat: kcl rust plugin impl and example

[coveralls]

Pull Request Test Coverage Report for Build 10536190681

Details

• 47 of 49 (95.92%) changed or added relevant lines in 2 files are covered.
• 3 unchanged lines in 1 file lost coverage.
• Overall coverage increased (+0.05%) to 70.974%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
kclvm/runtime/src/stdlib/plugin.rs	9	11	81.82%

Files with Coverage Reduction	New Missed Lines	%
kclvm/sema/src/core/scope.rs	3	68.57%

Totals
Change from base Build 10523809943:	0.05%
Covered Lines:	51573
Relevant Lines:	72665

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💛 - Coveralls