feat(common): add patternHasher utility for hashing and restoring string from special characters

[barelyhuman]

Description

adds a utility function that hashes input strings containing the passed in pattern and allows for restoration of the original string. It includes support for custom matchers and handles cases where no variables are matched.

Contribution Checklist:

• The pull request only addresses one issue or adds one feature.
• The pull request does not introduce any breaking changes
• I have added screenshots or gifs to help explain the change if applicable.
• I have read the contribution guidelines.
• Create an issue and link to the pull request.

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[Copilot]

Pull Request Overview

This PR introduces a new utility function patternHasher that replaces variable patterns (like {{var_name}}) in strings with unique hashes, and provides a mechanism to restore the original patterns. This is specifically designed for sanitizing URLs containing Bruno variables before validation.

Key Changes:

• Implements djb2 hashing algorithm to generate unique identifiers for matched patterns
• Provides a restore function to reverse the hashing operation
• Includes comprehensive test coverage with multiple edge cases

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 5 comments.

File	Description
packages/bruno-common/src/utils/template-hasher.ts	New utility implementing pattern hashing with configurable regex support
packages/bruno-common/src/utils/template-hasher.spec.ts	Test suite covering basic hashing, multiple patterns, custom matchers, and non-matching cases

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