SPICE - Calculate instrument spin phase offset using spice

[subagonsouth]

Algorithm Description:

Requirements:

Currently the imap_processing.spice.geometry.get_spacecraft_to_instrument_spin_phase_offset() function is implemented with a hard coded offset table for each instrument. It would be preferable to implement this function such that it uses spice with the latest imap frame kernel to compute the offset for each instrument. The complicating factor is that each instrument frame is defined differently and thus, the boresight vector will likely need to be used. Some instrument's boresight vector may not give the desire result.