Add Kaguyatc IsisLabel, Naifspice driver (#487)

* Made isis label spacecraft_clock_start/stop_counts handle keywords with units

* Add new kaguya isislabel naifspice driver

* Add test and test data for the new kaguya driver

* Fixes to kaguyami tests and updated kaguyatc tests

* Adds missing kernels for kaguyami test

* IsisLabelNaifSpice driver and IsisLabelIsisSpice driver now get the right exposure duration key

* Fixes for ISIS, CSM inconsistances

* Changed any sct2e call that converted the string to float to scs2e calls

* Fixed logging in isd_generate

* Fixes inconsistencies between kaguyaTC drivers

* Fixed tests

* Wrapped all spice functions in not hasattr checks

* Removed spacecraft_name override in IsisLabel NaifSpice driver

* Fixed up drivers and tests

* Fixed haiku like doc string descriptions