feat(compiler-base-error): add 'rustc_errors' and 'rustc_span' in 'CompilerBase/3rdparty'

[zong-zhe]

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

• N
• Y

issue #115

2. What is the scope of this PR (e.g. component or file name):

compiler_base/3rdparty/rustc_errors
compiler_base/3rdparty/rustc_span

3. Provide a description of the PR(e.g. more details, effects, motivations or doc link):

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Other

This is the first step for Compiler-Base-Error in issue #115.

Reuse 'styled_buffer.rs' in 'rustc_errors', and 'styled_buffer.rs' has been modified to fit the feature of 'Compiler-Base'.

• add method 'appendl()' and 'putl()' to 'StyledBuffer'.
• replaced the 'enum Style' with 'trait Style' to support extending more styles.
• add some test cases for 'StyledBuffer'.

Copy 'rustc_span' in kclvm to compiler_base/3rdparty.

4. Are there any breaking changes?(Y/N) and describe the breaking changes(e.g. more details, motivations or doc link):

• N
• Y

5. Are there test cases for these changes?(Y/N) select and add more details, references or doc links:

• Unit test
• Integration test
• Benchmark (add benchmark stats below)
• Manual test (add detailed scripts or steps below)
• Other

The test case is in the 'compiler_base/lib.rs', and shows how the 'StyledBuffer' work.

6. Release note

Please refer to Release Notes Language Style Guide to write a quality release note.

None

[coveralls]

Pull Request Test Coverage Report for Build 2824089938

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 58.984%

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Totals
Change from base Build 2800957292:	0.0%
Covered Lines:	21335
Relevant Lines:	36171

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💛 - Coveralls

[Peefy]

LGTM