[FR] - remove limit on DREP metadata

[CarlosLopezDeLara]

Internal/External
Internal if an IOHK staff member.
External otherwise.

Area
Conway

Describe the feature you'd like
Currently, Drep metadata size plays by the same rules of pools metadata. Since CIP100 proposes to use jsonld, the current limit is insufficient. It will be upto dbsync to stablish a limit for them to actually download the metadata into the db.

Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.

Additional context / screenshots
Add any other context or screenshots about the feature request here.