Fix part of #6104: Add support for worked examples (GSoC 4.1 PR 2.1)

[Neer-rn]

Explanation

Fixes part of #6104

This PR as of now introduces the parser contract required for worked-example question and answer attributes, which can contain nested HTML.

Essential Checklist

• The PR title starts with "Fix #bugnum: " (If this PR fixes part of an issue, prefix the title with "Fix part of #bugnum: ...".)
• The explanation section above starts with "Fixes #bugnum: " (If this PR fixes part of an issue, use instead: "Fixes part of #bugnum: ...".)
• Any changes to scripts/assets files have their rationale included in the PR explanation.
• The PR follows the style guide.
• The PR does not contain any unnecessary code changes from Android Studio (reference).
• The PR is made from a branch that's not called "develop" and is up-to-date with "develop".
• The PR is assigned to the appropriate reviewers (reference).

For UI-specific PRs only

Will upload when this gets ready for review.

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[github-actions]

Coverage Report

Results

Number of files assessed: 5
Overall Coverage: 88.74%
Coverage Analysis: PASS ✅

Passing coverage

Files with passing code coverage

File	Coverage	Lines Hit	Status	Min Required
MathTagHandler.kt utility/src/main/java/org/oppia/android/util/parser/html/MathTagHandler.kt	84.21%	96 / 114	✅	70%
PolicyPageTagHandler.kt utility/src/main/java/org/oppia/android/util/parser/html/PolicyPageTagHandler.kt	93.94%	31 / 33	✅	70%
ConceptCardTagHandler.kt utility/src/main/java/org/oppia/android/util/parser/html/ConceptCardTagHandler.kt	86.36%	19 / 22	✅	70%
CustomHtmlContentHandler.kt utility/src/main/java/org/oppia/android/util/parser/html/CustomHtmlContentHandler.kt	86.62%	123 / 142	✅	70%
ImageTagHandler.kt utility/src/main/java/org/oppia/android/util/parser/html/ImageTagHandler.kt	100.00%	62 / 62	✅	70%

To learn more, visit the Oppia Android Code Coverage wiki page

[github-actions]

Coverage Report

Results

Number of files assessed: 6
Overall Coverage: 88.98%
Coverage Analysis: PASS ✅

Passing coverage

Files with passing code coverage

File	Coverage	Lines Hit	Status	Min Required
MathTagHandler.kt utility/src/main/java/org/oppia/android/util/parser/html/MathTagHandler.kt	84.21%	96 / 114	✅	70%
PolicyPageTagHandler.kt utility/src/main/java/org/oppia/android/util/parser/html/PolicyPageTagHandler.kt	93.94%	31 / 33	✅	70%
ConceptCardTagHandler.kt utility/src/main/java/org/oppia/android/util/parser/html/ConceptCardTagHandler.kt	86.36%	19 / 22	✅	70%
CustomHtmlContentHandler.kt utility/src/main/java/org/oppia/android/util/parser/html/CustomHtmlContentHandler.kt	86.62%	123 / 142	✅	70%
WorkedExampleTagHandler.kt utility/src/main/java/org/oppia/android/util/parser/html/WorkedExampleTagHandler.kt	100.00%	8 / 8	✅	70%
ImageTagHandler.kt utility/src/main/java/org/oppia/android/util/parser/html/ImageTagHandler.kt	100.00%	62 / 62	✅	70%

To learn more, visit the Oppia Android Code Coverage wiki page