adding permission function

[adicatur]

giving function for permission, hence user can use it without create …from scratch

1. User should set false for configuration permission e.g Qiscus.getChatConfig() .setEnableRequestPermission(false)
2. User call one of permission function e.g btnAddFile.setOnClickListener(v -> { requestAddFilePermission(); });

[codecov[bot]]

Codecov Report

Merging #24 into develop will not change coverage. The diff coverage is 0%.

@@          Coverage Diff           @@
##           develop    #24   +/-   ##
======================================
  Coverage        0%     0%           
======================================
  Files          119    119           
  Lines         9454   9467   +13     
  Branches       978    978           
======================================
- Misses        9454   9467   +13

Impacted Files	Coverage Δ
...qiscus/sdk/ui/fragment/QiscusBaseChatFragment.java	0% <0%> (ø)	:arrow_up:

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