#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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• Changes are described in the pull request or in a referenced issue.
• The test suite compiles and runs without any error.
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[github-actions]

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[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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