feat: Initial implementation for slack Api

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Name	Status	Preview	Updated
guardian	✅ Ready (Inspect)	Visit Preview	Nov 18, 2022 at 9:49AM (UTC)

[coveralls]

Pull Request Test Coverage Report for Build 3495864813

• 0 of 32 (0.0%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.3%) to 74.574%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
core/appeal/service.go	0	3	0.0%
api/handler/v1beta1/approval.go	0	29	0.0%
<!--	Total:	0	32	0.0%	-->

Totals
Change from base Build 3488274545:	-0.3%
Covered Lines:	6121
Relevant Lines:	8208

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💛 - Coveralls

[ravisuhag]

@singhvikash11 Slack for approvals etc. should act like a client only. We should not club it with the server code. Can you first describe and discuss your approach on an issue. So that we are aligned on approach.