Fix #4202: Add support for parsing HasIntegerPartEqualTo rule type.

[TanishMoral11]

Fixes #4202 : This PR adds support for parsing the "HasIntegerPartEqualTo" rule type for fractions in the Oppia Android app.

Changes Made

• Updated test_exp_id_2.json to include the "HasIntegerPartEqualTo" rule type to ensure the rule is tested properly.
• Updated StateRetriever.kt to handle the "HasIntegerPartEqualTo" rule in the createExactInputForFractionInput() method.
• Added parsing logic for the "HasIntegerPartEqualTo" rule by adding a new check in createExactInputForFractionInput() to handle this rule type.

---

Essential Checklist

• 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: ...".)
• 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).

[TanishMoral11]

Hey @adhiamboperes , PTAL !!

[github-actions]

Coverage Report

Results

Number of files assessed: 1
Overall Coverage: 0.00%
Coverage Analysis: PASS ✅

Exempted coverage

Files exempted from coverage

File	Exemption Reason
StateRetriever.kt domain/src/main/java/org/oppia/android/domain/util/StateRetriever.kt	This file is incompatible with code coverage tooling; skipping coverage check.

Refer test_file_exemptions.textproto for the comprehensive list of file exemptions and their required coverage percentages.

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