feat: allow using options object in EntityManager.find()

[B4nan]

EM and EntityRepository now supports providing options in object:

const books = await booksRepository.find({ author: '...' }, {
  populate: ['author'],
  limit: 1,
  offset: 2,
  sort: { title: QueryOrder.DESC },
});

[coveralls]

Pull Request Test Coverage Report for Build 160

• 6 of 6 (100.0%) changed or added relevant lines in 3 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

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Totals
Change from base Build 158:	0.0%
Covered Lines:	1328
Relevant Lines:	1328

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💛 - Coveralls