STY: standardize instrument reference and acknowledgements

[jklenzing]

Is your feature request related to a problem? Please describe.
Some instruments store the ref and ack in the module itself, some in specialized methods modules.

Describe the solution you'd like
Use a standardized format with methods files and the general init routine.

Describe alternatives you've considered
Access these strings via functions similar to pysatMadrigal.

Additional context
Followon to #119

[jklenzing]

Bumping this issue due to complications in the existing setup. omni data requires a tag pass-through, which is not supported by the existing standard default routine.

[jklenzing]

Remaining to update:

• formosat1 ivm
• iss fpmu
• jpl gps
• omni hro