realm compact

[blagoev]

Support realm compact.

fixes #803

[nielsenko]

LGTM

I think it is prudent not to spawn an isolate - users can do that themselves. Would be nice if realm-core exposed an async interface for this though.

[coveralls]

Pull Request Test Coverage Report for Build 3387542209

• 0 of 6 (100.0%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.7%) to 88.978%

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Totals
Change from base Build 3385625020:	-0.7%
Covered Lines:	2220
Relevant Lines:	2495

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💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build 3394922515

• 16 of 17 (94.12%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.3%) to 89.104%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
lib/src/realm_class.dart	12	13	92.31%

Totals
Change from base Build 3393646855:	0.3%
Covered Lines:	2756
Relevant Lines:	3093

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💛 - Coveralls

[blagoev]

@nielsenko added a test for a worker isolate.

[desistefanova]

I think we need to test if:

• a compacted realm could be opened
• a synced realm populated with data could be compacted and the opened with the same number of rows.
• the size of compacted realm file is less than the size of a synced populated ream that had been frozen before the compaction.

[nirinchev]

The API should be sync

[nirinchev]

Looks mostly there - the main remaining thing is to make sure we're not polluting tests by subscribing to all objects from a collection.

[desistefanova]

I have added some small suggestions about formatting and naming. It looks good.