feat: Addition of stripe test client id

[kushthedude]

Fixes #6345

Changes proposed in this pull request:

• Moved Stripe credentials to Admin Class.
• Addition on Test_Client_Id.

Checklist

• I have read the Contribution & Best practices Guide and my PR follows them.
• My branch is up-to-date with the Upstream development branch.
• The unit tests pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)

• All the functions created/modified in this PR contain relevant docstrings.

[kushthedude]

@shreyanshdwivedi @uds5501 @mrsaicharan1 Please Review

[codecov]

Codecov Report

Merging #6358 into development will increase coverage by <.01%.
The diff coverage is 100%.

@@               Coverage Diff               @@
##           development    #6358      +/-   ##
===============================================
+ Coverage        65.41%   65.42%   +<.01%     
===============================================
  Files              287      287              
  Lines            14724    14727       +3     
===============================================
+ Hits              9632     9635       +3     
  Misses            5092     5092

Impacted Files	Coverage Δ
app/models/setting.py	91.5% <100%> (+0.08%)	⬆️
app/api/schema/settings.py	100% <100%> (ø)	⬆️

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[iamareebjamal]

Please update revises and down_revision

[kushthedude]

@iamareebjamal Please Check

[shreyanshdwivedi]

@kushthedude travis is failing. Please fix

[kushthedude]

@iamareebjamal This is the second time I am getting Dredd timeout, I will restart the build and it might be fine. Is this issue from our side ?

[kushthedude]

@shreyanshdwivedi It's fixed, IDK what was the reason of Dredd timeout before, They are up now

[kushthedude]

@iamareebjamal @CosmicCoder96 @uds5501 Please Review