Combine NAE objectives into a single one

[dpanici]

Add a new FixNearAxisR,FixNearAxisZ, FixNearAxisLambda objectives that combines all of the many FixSumModes objectives required for the fixed near axis behavior constraint into single objectives, which makes the output after a solve much more legible (only 3 errors reported instead of 20-40, one for each FixSumModes objective)

These objectives are now created when get_NAE_constraints util function is called

• [ ] understand better why tolerance for QSC test had to increase

Resolves #528

#829 should be merged in first before this one