Macro: Provide save/open ket and molv3000 ketcher API for macromolecules

[rrodionov91]

Background It needs to have an ability to save/open ket and molv3000 files through ketcher API. It should be available in global "ketcher" variable similar as for micromolecules.

The following API methods should be changed/implemented:

• [x] Implement getKet for Macromolecules
• [x] Implement getMol for Macromolecules
• [x] Implement setMolecule for Macromolecules
• [x] Implement addFragment for Macromolecules
• [x] layout should throw an Error 'layout is not available' in macro mode
• [x] recognize should throw an Error 'recognize is not available' in macro mode
• [x] generateImage should work with macromolecules; Most likely, output will be different from molecules drawn in Ketcher
• [x] setSettings – when executed does nothing, as there are no settings for macro mode yet (may affect preview for monomers)
• [x] containsReaction – no actual changes in functionality; returns true if structure has a reaction in micro mode
• [x] getSmiles, getCdx, ... and other formats, except getKet and getMolfile – throw Error

[Zhirnoff]

Manual tests added to automation table