fix: in-app messaging proguard rules missing

[levibostian]

Gist proguard settings didn't get copied over when in-app module code was migrated from Gist SDK into the CIO SDK. This PR adds those proguard rules back. Also enables proguard on sample apps so we can better test Release builds like customers are.

Fixes: https://github.com/customerio/opsbugs/issues/3627

[github-actions]

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[github-actions]

Sample app builds 📱

Below you will find the list of the latest versions of the sample apps. It's recommended to always download the latest builds of the sample apps to accurately test the pull request.

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• java_layout: levi/in-app-release-builds (1689883677)
• kotlin_compose: levi/in-app-release-builds (1689883663)

[codecov]

Codecov Report

Merging #241 (acaf3c3) into main (e9b5d0c) will increase coverage by 29.55%.
The diff coverage is n/a.

@@              Coverage Diff              @@
##               main     #241       +/-   ##
=============================================
+ Coverage     20.20%   49.76%   +29.55%     
- Complexity       27      237      +210     
=============================================
  Files            19      108       +89     
  Lines           480     2781     +2301     
  Branches         99      364      +265     
=============================================
+ Hits             97     1384     +1287     
- Misses          371     1282      +911     
- Partials         12      115      +103     

see 89 files with indirect coverage changes

[github-actions]

Build available to test
Version: levi-in-app-release-builds-SNAPSHOT
Repository: https://s01.oss.sonatype.org/content/repositories/snapshots/