Include development effort estimation in RFF / YIP

Currently there no development effort estimates includes in RFF / YIP which are subject to community votes.

Due to the missing development effort estimation the community is not able to prioritize development tasks.
There might be RFF / YIP with low development effort and high positive impact and vice versa.

In addition this effort intransparency becomes a high risk for fraud in case the development tasks are financed with the community treasury. (ZERO TRUST)

Mandatory listing of expected development effort and high level task overview in each RFF / YIP
As well include an estimation confidence- and complexity-level in the evaluation.

Further discussion: Link these estimates to GitHub workflows.