[WIP] Pallet Wrappers PoC

[4meta5]

PoC for #257

Scope for this PR is currently the OzSystem Wrapper. Scope may be expanded before merging if the OzSystem Wrapper design is approved.

TODOs

• [x] impl OzSystem for generic::Runtime
• [x] use OzSystem in frame_system::Config for generic::Runtime
• [x] use OzSystem in pallet_timestamp::Config for generic::Runtime
• [x] use OzSystem in parachain_info::Config for generic::Runtime
• [x] use OzSystem in pallet_proxy::Config for generic::Runtime
• [x] use OzSystem in pallet_utility::Config for generic::Runtime
• [ ] use OzSystem in pallet_scheduler::Config for generic::Runtime
• [ ] use OzSystem in pallet_preimage::Config for generic::Runtime
• [ ] use OzSystem in pallet_balances::Config for generic::Runtime
• [ ] use OzSystem in cumulus_pallet_parachain_system::Config for generic::Runtime

Logistics

• move oz-wrappers to root directory to share between templates
• once derive_impl is fixed, use it to generate assignments for all <OzSystem<Configuration> as DefaultConfig>::$TYPES

Notes for Reviewers

frame macros used include:

• derive_impl
• register_default_impl
• inject_runtime_type

Follow Ups / Parallel Tasks

As mentioned internally, it may be productive for @ozgunozerk to tackle one of these in parallel to see distinct approaches and explore the design space in general. Remaining pallet abstraction groupings:

• OzTokens
• OzConsensus
• OzGovernance
• OzEVM
• OzXCM

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[4meta5]

After internal discussion, we are going with a different PoC approach that will leverage our own custom macros to expand inner code into the impl blocks, construct_runtime declaration, and RuntimeApi impls.

Opening WIP PR of the above approach later today :)