* feat: enables prometheus rules and alerts which can be sent to alertmanager

* chore: adding configs for alertmanager, alert, and prom

* chore: alerts WIP

* chore: alerts WIP

* chore: alerts WIP

* chore: setRules API will update rules

* chore: initialization of prometheus related stuff moved to separate function

* chore: alerts WIP

* chore: alerts WIP

* fix: r.promConfig was nil

* feat: routing alertmanager apis to alertmanager service at nginx

* chore: not writing to localDB if string parsing gives error

* feat: list alerts API

* chore: error in creating multiple groups

* feat: CRUD APIs for rules working

* chore: changed prometheus version

* chore: updated AlertingRuleResponse struct's Id json value

* chore: updated prometheus's version

* chore: will load rules from database on bootup

* feat: crud APIs for notification channels WIP

* fix: changed ALERTMANAGER_API_PREFIX

* chore: enabling scrape and notify discover manager

* chore: fixing path for signoz.db

* chore: used transactions for rules APIs

* chore: editchannel API updated and other apis refactored

* chore: fixed merge conflicts

* chore: changing createChannel api from yaml to json reader

* chore: changing editChannel api from yaml to json reader

* chore: porting loadChannels to json format

* chore: editRule returning rule not found

* chore: pre-release

* chore: fixed db path for persistence

* release: v0.5.0