fieldTypes: add and allow users to define tooltips

[pamfilos]

Ported from: cernanalysispreservation/analysispreservation.cern.ch#2760

Solution to be copied: cernanalysispreservation/analysispreservation.cern.ch#2800

[Ansh-Sarkar]

Hi @pamfilos I'd love to work on this. Have gone through the code base once and the major portions as suggested by @miguelgrc in a previous discussion. I feel this would help me get a hang of certain portions of the code base and help me understand everything better for future contributions.

Kindly do let me know if this can be assigned to me. Thanks !

[miguelgrc]

Hi @Ansh-Sarkar, sure, I have assigned it to you. I will be away for the next two weeks so I won't be very active, but if you need help @pamfilos can give you a hand. Make sure to fork the repo and make the PR from your fork.

[Ansh-Sarkar]

Thanks a ton ! I'll keep this in mind.