Added filters to search for job applications

[penguinc00kies]

• slightly modified model too to allow for join query in job_applications.js

Description

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[linear]

TCES-89 Clean Up Job Applications Backend

[04kash]

Converting to a draft as we need filtering and sorting to be a part of the same endpoint so that they can be applied all together . This can optionally be used as starter code when working on https://linear.app/tces/issue/TCES-89/clean-up-job-applications-backend.

[04kash]

Closing in favour of #159