Support filter expressions for numbers

[ndr-brt]

Feature Request

Currently if we try to filter an asset by a numeric field with postgresql database, e.g.:

{
    "@context": {
        "odrl": "http://www.w3.org/ns/odrl/2/"
    },
    "@type": "QuerySpec",
    "offset": 0,
    "limit": 10,
    "filterExpression": [
        {
            "operandLeft": "https://w3id.org/edc/v0.0.1/ns/month",
            "operator": "=",
            "operandRight": 12
        }
    ]
}

we'll receive this error:

SEVERE 2023-12-05T10:59:28.1771974 JerseyExtension: Unexpected exception caught
org.eclipse.edc.spi.persistence.EdcPersistenceException: org.postgresql.util.PSQLException: ERROR: operator does not exist: text = double precision
  Hint: No operator matches the given name and argument types. You might need to add explicit type casts.

It would be nice to have numbers supported as it was done for boolean.

Which Areas Would Be Affected?

postgres statement building

Why Is the Feature Desired?

Are there any requirements?

Solution Proposal

If possible, provide a (brief!) solution proposal.

[github-actions]

This issue is stale because it has been open for 14 days with no activity.

[github-actions]

This issue was closed because it has been inactive for 7 days since being marked as stale.

[github-actions]

This issue was closed because it has been inactive for 7 days since being marked as stale.

[github-actions]

This issue is stale because it has been open for 14 days with no activity.