As a user, I can add additional filters for native and custom fields on the Xray issue picker dialog

As a user, I can filter issues by custom criteria using the Add Tests and Add Test Sets dialog. Currently, only a number of native fields are supported.

ACs:

• the user can choose any native Jira field associated with the target issue to act as filter criteria
• the user can choose any Jira custom field, as long as the custom field type is supported by Xray, associated with the target issue to act as filter criteria
  • checkboxes
  • labels
  • radio buttons
  • select list (single choice)
  • select list (multiple choice)
  • text field (single line/multi line)
  • number
  • other (text field - try to search by text)
• The default filters for each dialog remain unchanged
• Xray custom filters should also be available when applicable (when searching for Tests), e.g.
  • Test Type
  • Test Set 
  • Test Set Fix Version
  • Requirement
  • Requirement Fix Version
• multiple filters can be added
• "project" should be added by default as a filter, with the current project