feat: impl format tool.

[Peefy]

Why

Formatting tool rewritten in Rust, Issue Number: #35. The original KCL formatting tool is written in python, which has low performance. It is rewritten using Rust tools according to the content of the route plan #29.

What

KCL Rust version of the Format tool, and provides format APIs to further build tools such as the format CLI

How

The Format tool is built based on AST Printer tool #5. The principle is to parse the code that needs to be formatted into AST through the parser, and then recursively traverse the AST to print it as KCL source code.

PR Merge Deps

#88 Merged

Tests

Unit Tests

src/tools/format/tests.rs - mainly unit tests for input and output comparison of code with different KCL syntax

Benchmark

[chai2010]

LGTM

[coveralls]

Pull Request Test Coverage Report for Build 2609397302

• 107 of 112 (95.54%) changed or added relevant lines in 4 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.3%) to 41.052%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
kclvm/tools/src/format/tests.rs	54	55	98.18%
kclvm/tools/src/format/mod.rs	40	44	90.91%

Totals
Change from base Build 2587201011:	0.3%
Covered Lines:	15172
Relevant Lines:	36958

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💛 - Coveralls

[ldxdl]

LGTM

[zong-zhe]

LGTM