#302 Fixed parse error on alias mapping keys

[fktn-k]

This PR addresses the issue #302 by the following changes:

• The handling of alias nodes has been fixed in both the parser and the lexer since they didn't consider alias mapping keys.
• The deserialization of scalar nodes has been changed to correctly parse anchor/alias nodes.
• The extraction of anchor names has been changed since some invalid patterns were not correctly detected.
• The test suite has been updated to validate the above changes.

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Pull Request Checklist

Read the CONTRIBUTING.md file for detailed information.

• [x] Changes are described in the pull request or in a referenced issue.
• [x] The test suite compiles and runs without any error.
• [x] The code coverage on your branch is 100%.
• [x] The documentation is updated if you added/changed a feature.

Please don't

• The C++11 support varies between different compilers and versions. Please note the list of supported compilers. Some compilers like GCC 4.7 (and earlier), Clang 3.3 (and earlier), or Microsoft Visual Studio 13.0 and earlier are known not to work due to missing or incomplete C++11 support. Please refrain from proposing changes that work around these compiler's limitations with #ifdefs or other means.
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[github-actions[bot]]

:octocat: Upload Coverage Event Notification

Coverage data has been uploaded for the commit d6a2e9f5f5c47372044fff0e3c54979dfcef2c15. You can download the artifact which contains the same file uploaded to the Coveralls and its HTML version.

Name	fkYAML_coverage.pr303.zip
ID	1372482939
URL	https://github.com/fktn-k/fkYAML/actions/runs/8497009204/artifacts/1372482939

[coveralls]

Pull Request Test Coverage Report for Build 8497009204

Details

• 71 of 71 (100.0%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

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Totals
Change from base Build 8492754549:	0.0%
Covered Lines:	3054
Relevant Lines:	3054

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