feat(api-client): Create controller for Variable module

[vr-varad]

Description

Api-client controller for variables

Fixes #351

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• [x] My PR follows the style guidelines of this project
• [x] I have performed a self-check on my work

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• [x] I have followed the coding guidelines
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[codiumai-pr-agent-free[bot]]

Failed to generate code suggestions for PR

[vr-varad]

@rajdip-b Variables Done.

[vr-varad]

@rajdip-b Resolved

[vr-varad]

@rajdip-b