Add Integrity Flags messages [OTA-121]

[fpezzinosn]

Description

@swift-nav/devinfra

These messages are:

• MSG_SSR_FLAG_HIGH_LEVEL
• MSG_SSR_FLAG_SATELLITES
• MSG_SSR_FLAG_TROPO_GRID_POINTS
• MSG_SSR_FLAG_IONO_GRID_POINTS
• MSG_SSR_FLAG_IONO_TILE_SAT_LOS
• MSG_SSR_FLAG_IONO_GRID_POINT_SAT_LOS

API compatibility

Does this change introduce a API compatibility risk?

No, just adding new messages to a new package.

API compatibility plan

If the above is "Yes", please detail the compatibility (or migration) plan:

JIRA Reference

https://swift-nav.atlassian.net/browse/OTA-121

[silverjam]

@fpezzinosn -- FYI, we need a follow-up task to review the PDF documentation for these messages, see https://github.com/swift-nav/libsbp/blob/staging/docs/sbp.pdf and check out the "units" columns in particular (mainly, the units need to very simple otherwise they'll overflow the layout in the PDF, so any "usage notes" or "caveats" for the units need to move into the message description).

[fpezzinosn]

@fpezzinosn -- FYI, we need a follow-up task to review the PDF documentation for these messages, see https://github.com/swift-nav/libsbp/blob/staging/docs/sbp.pdf and check out the "units" columns in particular (mainly, the units need to very simple otherwise they'll overflow the layout in the PDF, so any "usage notes" or "caveats" for the units need to move into the message description).

Ok, will do. I'll also enable the others that are currently set as private to check how their documentation looks.