Optimize \Value\ method for efficient key lookup in Dict implementation

[coderabbitai]

As requested by @ccamel, this issue aims to improve the performance of the `Value` method in the `Dict` implementation within `engine/dict.go`. Currently, the `Value` method iterates over all key-value pairs, resulting in O(n) time complexity for key retrieval. The use of a list of terms for `Dict` representation was chosen to leverage Prolog’s pattern matching and unification capabilities through its compatibility with compound terms. However, there's room for enhancement in this approach to boost performance.

PR URL: #17

Comment URL: #17 (comment)