JIRA: https://jira.spring.io/browse/INT-4216
Add test for running empty array through `ChainFileListFilter`
Assure no exceptions are throw when filter input is empty.
INT-4216: Add fix for ChainFileListFilter edge case
INT-4216: Fix checkstyle error on test class
Add copyright header to test file
* Polishing for `ChainFileListFilter` JavaDocs
* Move `CompositeFileListFilterTests` and `ChainFileListFilterIntegrationTests` to the `filters` package instead of `file` core
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