Fix #5473: Add wiki guide for upgrading the app's compile/target SDK versions (#5538) ## Explanation Fixes #5473 This PR introduces a new wiki page that describes the process by which we can carefully upgrade the app to a newer compile/target SDK version (with a specific emphasis on the target SDK version). This is largely meant to capture past processes we have followed since those weren't documented in an easily reproducible way. The intent is for this now-documented process to be trialed by upgrading the app to SDK 34 in order to address #5535 (though that technically means that part (1) of the documented process has already been completed). This PR does not: - Address exactly when the compile version should be updated, except when required by the target SDK version. It's expected that the team will perform an out-of-band analysis for cases when the compile SDK actually needs to be upgraded sooner than the target SDK. - Specify a strongly enforced cadence for upgrading the target SDK since the Google Play Console and Google Play app policy seems to already perform this function, though it does add a recommendation for checking for updates periodically (July/August every year). ## Essential Checklist - [x] The PR title and explanation each start with "Fix #bugnum: " (If this PR fixes part of an issue, prefix the title with "Fix part of #bugnum: ...".) - [x] Any changes to [scripts/assets](https://github.com/oppia/oppia-android/tree/develop/scripts/assets) files have their rationale included in the PR explanation. - [x] The PR follows the [style guide](https://github.com/oppia/oppia-android/wiki/Coding-style-guide). - [x] The PR does not contain any unnecessary code changes from Android Studio ([reference](https://github.com/oppia/oppia-android/wiki/Guidance-on-submitting-a-PR#undo-unnecessary-changes)). - [x] The PR is made from a branch that's **not** called "develop" and is up-to-date with "develop". - [x] The PR is **assigned** to the appropriate reviewers ([reference](https://github.com/oppia/oppia-android/wiki/Guidance-on-submitting-a-PR#clarification-regarding-assignees-and-reviewers-section)). ## For UI-specific PRs only N/A -- This is introducing a new wiki page and doesn't change the app itself.

BenHenning committed Oct 25, 2024