feat: Add coverage for: User defined number of bytes, Not found element into Bloom filter tests

[rodolfopietro97]

Greetings, team. I have created the following pull request aiming to enhance the code coverage of the bloom filter tests. Specifically, the proposed modifications target two instances:

• Where the user determines the size of the bloom filter (when new instance is created).
• The case where an item is not found within the bloom filter (when test function is called).

These amendments aim to improve the robustness and reliability of our bloom filter tests, ensuring a more comprehensive evaluation of its performance and functionality.

Code coverage BEFORE:

Code coverage AFTER:

[coveralls]

coverage: 91.837% (+0.5%) from 91.293% when pulling 8cf8ffe on rodolfopietro97:increase-code-coverage-bloom-filter into b35914b on vechain:master.