Move VM pallet extrinsics should also take additional weight itself

[borispovod]

We should add additional weight to sp-mvm pallet extrinsics. As we also spend CPU and Memory to initialize VM, etc.

For example, currently extrinsic execute uses dynamic weight only but there's should be a sum of this and sum constant value. That constant value should used as default, if transaction fails for example.

The value of the constant should be empirically chosen for each extrinsic and as starting point it means default 10000. Use runtime-benchmarking for this. Also there's some possibly useful tools: weight-meter and weight-gen.

Also, do not burn fees as it happens now. Move it to treasury.

• [ ] add "default" value for extrinsics
• [ ] add fee present as Config value
• [ ] send and accumulate fees in the treasury