Add Date Masking Buitlin Algorithm | Keep Year Only

[Afsalmc]

Fixes #ISSUSE_ID.

Changes proposed in this pull request:

• Add a builtin algorithm for masking dates. This Algo keeps the original year info and replace the rest of the date information with the first day of the year.

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[linghengqian]

• The PR did not pass the code formatting validation. You can execute first ./mvnw spotless:apply -Pcheck -T1C. Then execute ./mvnw checkstyle:check -Pcheck -T1C to manually adjust to repair the CI.

[strongduanmu]

Since this pr has long time no response, I will close it. If you still want to contribute this algorithm, a better place is the ShardingSphere Plugin repository - https://github.com/apache/shardingsphere-plugin.