feat: Add pagination and filters to the /collections endpoint

[juanmahidalgo]

Description

• Adds support for pagination params limit and page.
• Adds filters for: assignee, status , q, is_published
• Adds sort option to sort by relevance, name_asc, name_desc and newest

Closes #513

[coveralls]

Pull Request Test Coverage Report for Build 2312215779

• 46 of 68 (67.65%) changed or added relevant lines in 5 files are covered.
• 12 unchanged lines in 3 files lost coverage.
• Overall coverage decreased (-0.8%) to 68.922%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/ethereum/api/Bridge.ts	12	13	92.31%
src/Collection/Collection.model.ts	3	24	12.5%

Files with Coverage Reduction	New Missed Lines	%
src/Collection/Collection.service.ts	1	93.66%
src/Item/hashes.ts	1	94.12%
src/ethereum/api/Bridge.ts	10	80.0%

Totals
Change from base Build 2257856043:	-0.8%
Covered Lines:	2567
Relevant Lines:	3555

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💛 - Coveralls