Send boolean query parameters as true/false

[pavog]

Boolean query parameters were sent as 1 and 0, because that is the default of the generated code.
This PR changes them to true and false, which is the format used in the Hangar API documentation.

This affects two parameters:

• prioritizeExactMatch in getProjects()
• includeHiddenChannels in getProjectVersions()

The Hangar API accepts both formats:

• true / false
• 1 / 0

HangarAPIClient

setConfiguration() sets BOOLEAN_FORMAT_STRING on the configuration of the client. The ObjectSerializer reads the boolean format from the default configuration instead of the one used for the request, so it is set there as well.

Tests

• The expected values of prioritizeExactMatch and includeHiddenChannels are updated.
• A new test checks that a client with a custom configuration also sends true/false.