Migration to bare work flow

[hyochan]

Description

Due to issue on e3kit that it doesn't support expo environment, we need to migrate to bare work flow with react-native-unimodules.

Below is a reference from virgil security tech support

We are currently big fan of virgil security and we'd like to use this in our app. We also have youtube clip for this.

Tests

• Making sure current tests are all running ok!
• Added jest fetch mock.
• Remove unnecessary test code which is testing expo env which we aren't using any longer.
• Mock AsyncStorage from @react-native-community.

Checklist

Before you create this PR confirms that it meets all requirements listed below by checking the relevant checkboxes ([x]). This will ensure a smooth and quick review process.

• I read the Contributor Guide and followed the process outlined there for submitting PRs.
• I signed the [CLA].
• Run yarn lint && yarn tsc
• Run yarn test or yarn test -u if you need to update snapshot.
• I am willing to follow-up on review comments in a timely manner.

[codecov]

Codecov Report

Merging #108 into master will decrease coverage by 0.14%.
The diff coverage is 85.71%.

@@            Coverage Diff             @@
##           master     #108      +/-   ##
==========================================
- Coverage   87.71%   87.57%   -0.15%     
==========================================
  Files          33       33              
  Lines        1050     1046       -4     
  Branches      115      114       -1     
==========================================
- Hits          921      916       -5     
- Misses         79       80       +1     
  Partials       50       50