[MINI-1736] JS SDK API for In-App Purchase

[rleojoseph]

Description

• This PR has the Public APIs for the miniapp
• Sample app changes done just to make sure that the Service is working fine. Actualy Sample app changes will be done later in another ticket

Links

MINI-1736

Checklist

• I have completed all steps in the Contribution Checklist

[GondiTilak]

Looks good to me 👍

[codecov-commenter]

Codecov Report

Merging #243 (00583a3) into master (38bbb86) will decrease coverage by 0.91%.
The diff coverage is 67.74%.

@@            Coverage Diff             @@
##           master     #243      +/-   ##
==========================================
- Coverage   90.33%   89.42%   -0.91%     
==========================================
  Files          21       22       +1     
  Lines         569      596      +27     
  Branches       41       42       +1     
==========================================
+ Hits          514      533      +19     
- Misses         37       45       +8     
  Partials       18       18              

Impacted Files	Coverage Δ
js-miniapp-bridge/src/common-bridge.ts	81.93% <60.00%> (-1.41%)	⬇️
js-miniapp-sdk/src/modules/in-app-purchase.ts	77.77% <77.77%> (ø)
js-miniapp-sdk/src/miniapp.ts	93.75% <100.00%> (+0.20%)	⬆️

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[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
8.4% Duplication

[Climbatize]

LGTM