tap-linkedin-ads should fetch campaign & campaign_groups automatically.

[haleemur]

Summary

Currently, meltano variant tap-linkedin-ads requires the user to specify the campaign & campgain_group. However these are likely to evolve over time and not something that should be hard coded into the extraction confuration.

I looked at the singer-io variant, and that tap allows for the campaign & campaign group to not be hard coded. It actually fetches all campaign & campaign groups for the user

Proposal

The meltano variant tap should also fetch the campaign & campaign groups similar to the singer-io variant.

[pnadolny13]

Closed by #104