refactor: stop usage of deprecated fields in LineageNode

[sudo-suhas]

• Stop usage of v1beta1.LineageNode.{type, service}. The URN is now sufficient to uniquely identify the node.
• Modify interfaces and service to stop usage of core/asset.LineageNode, just use the URN.
  • core/asset.Service struct.
  • core/asset/LineageRepository interface.
• Remove the type core/asset.LineageEdge.

BREAKING CHANGES:

• Types modified - core/asset.Service, core/asset/LineageRepository.
• Type removed - core/asset.LineageEdge.

[coveralls]

Pull Request Test Coverage Report for Build 3334483510

• 35 of 35 (100.0%) changed or added relevant lines in 4 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.03%) to 86.085%

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Totals
Change from base Build 3334473100:	-0.03%
Covered Lines:	4875
Relevant Lines:	5663

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💛 - Coveralls

[StewartJingga]

Nice @sudo-suhas! Totally forgot that we now can do this

[StewartJingga]

~~Also CMIIW, this will require changes. on meteor's compass sink right? @sudo-suhas~~

Edit: Just tested this and it works fine, it seems like we still keep the API contract and just changing the internal APIs 👌