Implement Fee-Distribution REST

[rigelrozanski]

Just needs to be done in a separate PR as fee-distribution is getting quite large (#2236)

[alexanderbez]

Change label if you believe this is necessary for Game of Steaks :-)

[fedekunze]

Adding prelaunch-2.0 since voyager needs these for its staking2 milestone

[rigelrozanski]

Totally - I'll add this to my todo - the "delegation fee worth" query is not going to be so simple as it needs to replicate some core logic - may actually come paired with a distribution refactor to easily accommodate for the tx as well as query (tx logic wouldn't change)