feat: add accessor array protocol for dstructs/fifo

[Neerajpathak07]

Resolves none.

Description

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This pull request:

• Adds accessor array protocol for dstructs/fifo

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Coverage Report

Package	Statements	Branches	Functions	Lines
dstructs/fifo	$\color{green}710/710$ $\color{green}+0.00%$	$\color{green}61/61$ $\color{green}+0.00%$	$\color{green}18/18$ $\color{green}+0.00%$	$\color{green}710/710$ $\color{green}+0.00%$

The above coverage report was generated for the changes in this PR.

[Neerajpathak07]

added @template T here for better type safety and specify the type of elements the queue will hold. Also updated other methods with this!!