feat(api): add emergency contacts api

[almostinf]

Add emergency contacts API

Added API for working with emergency contacts - these are the contacts to which notifications will go to users in case of emergency types of problems in Moira

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 64.97462% with 138 lines in your changes missing coverage. Please review.

Project coverage is 52.41%. Comparing base (0197720) to head (a2a1456).
Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
mock/moira-alert/database.go	0.00%	52 Missing ⚠️
database/redis/emergency_contact.go	76.34%	11 Missing and 11 partials ⚠️
api/handler/emergency_contact.go	69.49%	12 Missing and 6 partials ⚠️
api/handler/team_emergency_contact.go	13.33%	13 Missing ⚠️
api/dto/emergency_contact.go	41.17%	10 Missing ⚠️
database/redis/reply/emergency_contact.go	79.06%	5 Missing and 4 partials ⚠️
database/redis/contact.go	82.05%	6 Missing and 1 partial ⚠️
database/redis/reply/contact.go	0.00%	3 Missing ⚠️
api/controller/emergency_contact.go	95.74%	1 Missing and 1 partial ⚠️
api/dto/contact.go	0.00%	2 Missing ⚠️

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Additional details and impacted files

@@             Coverage Diff             @@
##           master    #1078       +/-   ##
===========================================
- Coverage   66.85%   52.41%   -14.45%     
===========================================
  Files         219      291       +72     
  Lines       12778    16742     +3964     
===========================================
+ Hits         8543     8775      +232     
- Misses       3684     7395     +3711     
- Partials      551      572       +21     

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[AleksandrMatsko]

Надушнил немного. Глобальных кодовых проблем не вижу

[AleksandrMatsko]

Очепятка

[almostinf]

Исправил