feat: update mustache syntax

[ssddOnTop]

Summary:
Briefly describe the changes made in this PR.

Issue Reference(s):
Fixes #1767
/claim 1767

Summary by CodeRabbit

• New Features
  • Enhanced the formatting capabilities of mustache templates by implementing the Display trait.
• Bug Fixes
  • Improved expression parsing to handle optional leading dots.
• Tests
  • Added new test functions to evaluate dynamic expressions in mustache templates.

[coderabbitai]

Walkthrough

The recent changes involve updating the Mustache template syntax to support an optional leading dot in expressions and enhancing the display capabilities of the Mustache struct by implementing the Display trait. Additionally, the test suite has been expanded to cover these new syntax features and ensure backward compatibility with the existing syntax.

Changes

Files	Change Summary
src/mustache.rs	- Added use std::fmt::Display; - Replaced ToString with Display for Mustache - Updated parse_expression to handle optional leading dot
tests/.../expression_spec.rs	- Added tests for new and existing mustache expression syntax

Assessment against linked issues

Objective (Issue #)	Addressed	Explanation
Update mustache syntax to include optional leading dot (#1767)	✅
Ensure backward compatibility for existing syntax (#1767)	✅
Add unit tests for new syntax (#1767)	✅
Update website documentation (#1767)	❌	Documentation updates are not included in the PR.

The changes successfully introduce the new syntax while maintaining support for the existing mustache syntax, as evidenced by the updated parsing logic and comprehensive tests. However, updates to the documentation are required to fully complete the objectives.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.89%. Comparing base (13f6172) to head (41cd951).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1768   +/-   ##
=======================================
  Coverage   86.88%   86.89%           
=======================================
  Files         155      155           
  Lines       15596    15600    +4     
=======================================
+ Hits        13551    13555    +4     
  Misses       2045     2045           

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