split runtimes

[ETeissonniere]

In preparation of our staking testnet and parachain readyness efforts, this PR is breaking our current runtime in two different runtimes: one being used on our main and test networks and one specialized on staking. In the future, we will likely have a shell runtime used for when we start the parachain.

The support at the node level for the runtime_staking will be done in a separate PR. There is an issue for it in #422

[codecov]

Codecov Report

Merging #420 (36f5e5a) into master (998fe08) will decrease coverage by 1.36%.
The diff coverage is 9.84%.

@@            Coverage Diff             @@
##           master     #420      +/-   ##
==========================================
- Coverage   83.18%   81.82%   -1.37%     
==========================================
  Files          59       65       +6     
  Lines        8659     8818     +159     
==========================================
+ Hits         7203     7215      +12     
- Misses       1456     1603     +147     

Impacted Files	Coverage Δ
node/src/chain_spec.rs	100.00% <ø> (ø)
node/src/command.rs	0.00% <ø> (ø)
node/src/rpc.rs	0.00% <ø> (ø)
node/src/service.rs	0.00% <ø> (ø)
pallets/allocations/src/lib.rs	82.97% <ø> (ø)
pallets/reserve/src/lib.rs	59.57% <ø> (ø)
pallets/staking/src/benchmarking.rs	93.72% <ø> (ø)
pallets/staking/src/hooks.rs	76.08% <ø> (ø)
pallets/staking/src/lib.rs	83.20% <ø> (ø)
pallets/staking/src/migrations.rs	52.91% <ø> (ø)
... and 23 more

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