feat(api): Added controller to fetch all revisions of a variable

[yogesh1801]

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Description

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Fixes #271

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Developer's checklist

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

If changes are made in the code:

• [ ] I have followed the coding guidelines
• [ ] My changes in code generate no new warnings
• [ ] My changes are breaking another fix/feature of the project
• [ ] I have added test cases to show that my feature works
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• [ ] This PR requires an update to the documentation at docs.keyshade.xyz
• [ ] I have made the necessary updates to the documentation, or no documentation changes are required.

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PR Type

Enhancement

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Description

• Added a new endpoint getRevisionsOfVariable in VariableController to fetch revisions of a variable for a specific environment.
• Implemented getRevisionsOfVariable method in VariableService to handle the logic of fetching variable revisions from the database.
• Included authority checks to ensure the user has the necessary permissions to read variable revisions.

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Changes walkthrough 📝

Relevant files

Enhancement

variable.controller.ts Add endpoint to fetch revisions of a variable                        apps/api/src/variable/controller/variable.controller.ts Added a new endpoint getRevisionsOfVariable to fetch variable revisions. Implemented route parameters for variableId and environmentId. Applied RequiredApiKeyAuthorities decorator for authorization. +14/-0    variable.service.ts Implement service method to get variable revisions              apps/api/src/variable/service/variable.service.ts Added getRevisionsOfVariable method to fetch revisions from the database. Included authority check for reading variable revisions. Queried variableVersion table for revisions based on variableId and environmentId. +22/-0

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PR Reviewer Guide 🔍

⏱️ Estimated effort to review [1-5]	2
🧪 Relevant tests	No
🔒 Security concerns	No
⚡ Key issues to review	Possible Bug: The method getRevisionsOfVariable in variable.service.ts does not handle the case where no revisions are found for the given variableId and environmentId. It would be beneficial to add error handling or a response indicating that no revisions were found.
	Data Validation: Ensure that the parameters variableId and environmentId are properly validated before they are used in the database query to prevent any potential issues with malformed or malicious data.

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