Implemented MysqlFileManager

[lwj5]

Added an implementation of filemanager using MySQL for recording and indexing and file system to store files.

[coveralls]

Pull Request Test Coverage Report for Build 113

• 262 of 403 (65.01%) changed or added relevant lines in 16 files are covered.
• 2 unchanged lines in 2 files lost coverage.
• Overall coverage decreased (-0.1%) to 74.749%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/main/java/ai/preferred/venom/fetcher/AsyncResponseConsumer.java	2	3	66.67%
src/main/java/ai/preferred/venom/job/PriorityQueueScheduler.java	1	2	50.0%
src/main/java/ai/preferred/venom/Crawler.java	2	4	50.0%
src/main/java/ai/preferred/venom/response/StorageResponse.java	9	11	81.82%
src/main/java/ai/preferred/venom/storage/FileManagerCallback.java	9	11	81.82%
src/main/java/ai/preferred/venom/request/StorageFetcherRequest.java	12	16	75.0%
src/main/java/ai/preferred/venom/fetcher/StorageFetcher.java	53	59	89.83%
src/main/java/ai/preferred/venom/storage/DummyFileManager.java	23	33	69.7%
src/main/java/ai/preferred/venom/storage/MysqlFileManager.java	87	200	43.5%

Files with Coverage Reduction	New Missed Lines	%
src/main/java/ai/preferred/venom/fetcher/AsyncResponseConsumer.java	1	83.33%
src/main/java/ai/preferred/venom/job/AbstractQueueScheduler.java	1	63.16%

Totals
Change from base Build 97:	-0.1%
Covered Lines:	1042
Relevant Lines:	1394

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💛 - Coveralls

[sitfoxfly]

Only test phase requires mysql-connector-java dependency, right?

[lwj5]

No, it is needed to use MysqlFileManager, the user can override it if they require a different version.
For now we will consolidate and include the storage dependencies. If the project grows or if we require other implementations of FileManager, we will move to a multi-module maven project.