remove persistence and prepare for reorginizing storage

[coveralls]

Pull Request Test Coverage Report for Build 771598729

• 112 of 183 (61.2%) changed or added relevant lines in 7 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.5%) to 64.748%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/main.rs	0	1	0.0%
storage/src/lib.rs	19	22	86.36%
sql_engine/data_manipulation/query_plan/src/lib.rs	19	27	70.37%
data_repr/scalar/src/lib.rs	14	27	51.85%
sql_engine/catalog/src/lib.rs	31	47	65.96%
data_repr/binary/src/lib.rs	23	53	43.4%
<!--	Total:	112	183	61.2%	-->

Totals
Change from base Build 768136755:	0.5%
Covered Lines:	2520
Relevant Lines:	3892

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💛 - Coveralls