[EVM] Neuron precompile - weight setting

[gztensor]

Add following methods and E2E tests to neuron precompile:

• set_weights
• commit_weights
• reveal_weights

[open-junius]

should add these methods in a new neuron precompile, or the same precompile subnets as in #1075 @gztensor

[keithtensor]

Done in #1150.