Add Jump Consistent Hash implementation with tests

[jkyberneees]

• Updated README to include details on Jump Consistent Hash and its usage.
• Added JumpConsistentHash class with methods for index computation.
• Implemented tests for JumpConsistentHash to validate functionality and edge cases.
• Updated package.json to reflect changes in types and added new files.

[Copilot]

Pull Request Overview

Adds Jump Consistent Hash implementation as an alternative to the existing consistent hash ring. This provides a minimal-memory O(1) approach for mapping keys directly to bucket indexes.

• Added JumpConsistentHash class implementing the Lamping & Veach algorithm
• Comprehensive test suite covering functionality and edge cases
• Updated documentation and package configuration to support the new implementation

Reviewed Changes

Copilot reviewed 7 out of 9 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
package.json	Updated package metadata to include new Jump Hash files and changed types entry point
jump-hash.js	Core Jump Consistent Hash implementation with hash computation and bucket mapping
jump-hash.test.js	Complete test suite validating constructor, getIndex method, and distribution properties
demos/jump-consistent-hash.js	CommonJS demo showing basic usage
demos/jump-consistent-hash.ts	TypeScript demo showing basic usage
demos/consistent-hash.ts	TypeScript demo for the existing consistent hash implementation
README.md	Updated documentation explaining both implementations with usage examples

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