[Feature request] add staking/rewards on the EulerSimpleLens

[prabhatverma286]

Currently, there's no method on the Simple Lens to fetch a user's EUL balance. I believe its possible to get this information from the EulStakes contract, however, this is not explicitly advertised in the docs with examples.

Is it possible to add a simple function on the lens contract for non-technical users to query their EUL balance easily?