[$50] Add ability to search by metadata

[ajefts]

Add the ability to search for challenges by the metadata fields. For example, topgear would like to search for and see data in the "effort hours" field. The fields should also be available in the response. Let's discuss permission strategy for who should be able to view the metadata.

[ajefts]

fyi @rootelement

[rootelement]

Contest https://www.topcoder.com/challenges/30142350 has been created for this ticket.

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[rootelement]

Contest https://www.topcoder.com/challenges/30142350 has been updated - it has been assigned to thomaskranitsas.

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[ThomasKranitsas]

@ajefts do we allow specific metadata keys or should we think about how to allow “any kind of metadata”?

For example, ?meta.effortHours=<something>&meta.somethingElse=<something>.

So, anything with meta.* will be used for searching on the metadata property.

cc @rootelement

[rootelement]

This looks good @ThomasKranitsas Please open a ticket to get this implemented on a branch for our review.

[ThomasKranitsas]

PR #299

[rootelement]

Payment task has been updated: https://software.topcoder.com/review/actions/ViewProjectDetails?pid=30142350

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