fix(template): correctly serialize JSON for the commit fields

[ognis1205]

Description

Fixes inconsistent serde_json::Value string representations when applying regex matchers. Specifically, it ensures that:

• Value::String does not include surrounding quotes,
• other scalar types (Number, Bool, Null) are stringified appropriately,
• Object and Array are treated as unsupported and result in an error.

Closes #1143

Motivation and Context

Previously, serde_json::Value::String("example") was converted using to_string(), resulting in "\"example\"", which broke regex patterns expecting plain strings. This PR fixes that by:

• Matching and extracting raw strings for Value::String,
• Applying to_string() to Number, Bool, and Null,
• Raising a user-friendly error if the field is an Object or Array.

This makes pattern matching robust and predictable when working with JSON input from commit metadata or remote PR context.

How Has This Been Tested?

• Added unit tests for Commit::parse to verify field-based parsing logic using both author and remote attributes.
• Verified correct parser behavior using the following commit_parsers configuration in cliff.toml:

commit_parsers = [
 { message = "$^", skip = true },
 { field = "author.name", pattern = "github-actions", skip = true },
 { field = "author.email", pattern = "github-actions@github.com", skip = true },
 { field = "committer.name", pattern = "github-actions", skip = true },
 { field = "committer.email", pattern = "github-actions@github.com", skip = true },
 { field = "remote.pr_title", pattern = "^feat", group = "<!-- 00 -->🚀 Features" },
 { field = "remote.pr_title", pattern = "^fix", group = "<!-- 01 -->🐛 Bug Fixes" },
 { field = "remote.pr_title", pattern = "^refactor", group = "<!-- 02 -->🚜 Refactor" },
 { field = "remote.pr_title", pattern = "^docs", group = "<!-- 03 -->📚 Documentation" },
 { field = "remote.pr_title", pattern = "^perf", group = "<!-- 04 -->⚡ Performance" },
 { field = "remote.pr_title", pattern = "^style", group = "<!-- 05 -->🎨 Styling" },
 { field = "remote.pr_title", pattern = "^test", group = "<!-- 06 -->🧪 Testing" },
 { field = "remote.pr_title", pattern = "^chore\\(release\\)", skip = true },
 { field = "remote.pr_title", pattern = "^chore\\(deps.*\\)", skip = true },
 { field = "remote.pr_title", pattern = "^chore\\(pr\\)", skip = true },
 { field = "remote.pr_title", pattern = "^chore\\(pull\\)", skip = true },
 { field = "remote.pr_title", pattern = "^(chore|ci)", group = "<!-- 07 -->⚙️ Miscellaneous Tasks" },
 { field = "remote.pr_title", pattern = "^revert", group = "<!-- 08 -->◀️ Revert" },
 { field = "remote.pr_title", pattern = ".*", group = "<!-- 09 -->💼 Other" },
]

Screenshots / Logs (if applicable)

N/A

Types of Changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation (no code change)
• Refactor (refactoring production code)
• Other

Checklist:

• My code follows the code style of this project.
• I have updated the documentation accordingly.
• I have formatted the code with rustfmt.
• I checked the lints with clippy.
• I have added tests to cover my changes.
• All new and existing tests passed.

[welcome]

Thanks for opening this pull request! Please check out our contributing guidelines! ⛰️

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 40.23%. Comparing base (4c3c946) to head (7bc6d77).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1145      +/-   ##
==========================================
+ Coverage   40.04%   40.23%   +0.20%     
==========================================
  Files          21       21              
  Lines        1911     1914       +3     
==========================================
+ Hits          765      770       +5     
+ Misses       1146     1144       -2     

Flag	Coverage Δ
unit-tests	40.23% <100.00%> (+0.20%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[orhun]

Neat, thanks for your contribution!

[welcome]

Congrats on merging your first pull request! ⛰️

[ognis1205]

Thank you for providing this wonderful crate @orhun !