TEIIDDES-1322: Adds url properties text box to Teiid connection wizard page

* Adds a freeform textbox to allow url properties to be appended to the
  teiid connection url. It suggests that the string should be in the
  correct format but does not check it to allow the user the freedom to
  insert custom properties. The finished url is obvious so if the user has
  entered it incorrectly then it should be obvious.

* Support for url properties is already part of the TeiidServerJDBCURL
  class. Small fix required in latter class when using url properties.