Refactor common types within Dancelight and Starlight

[nanocryk]

Move them in tanssi-runtime-common with feature relay so that other runtimes don't pull unnecessary dependencies.

Do you see other common types that are worth moving too?

[github-actions]

WASM runtime size check:

Compared to target branch

dancebox runtime: 1688 KB (+4 KB) ⚠️

flashbox runtime: 1040 KB (no changes) ✅

dancelight runtime: 2448 KB (no changes) 🚨

starlight runtime: 2360 KB (+4 KB) ⚠️

container chain template simple runtime: 1336 KB (-4 KB) ✅

container chain template frontier runtime: 1628 KB (no changes) ✅

[github-actions]

Coverage Report

(master)

@@                        Coverage Diff                        @@
##           master   jeremy-refator-common-structs      +/-   ##
=================================================================
- Coverage   65.58%                          65.56%   -0.02%     
  Files         501                             501              
- Lines       82914                           82859      -55     
=================================================================
- Hits        54378                           54325      -53     
- Misses      28536                           28534       -2     

Files Changed	Coverage
/chains/orchestrator-paras/runtime/dancebox/src/lib.rs	90.04% (+0.01%)	✅
/chains/orchestrator-relays/runtime/dancelight/src/bridge_to_ethereum_config.rs	84.68% (-1.58%)	❗
/chains/orchestrator-relays/runtime/dancelight/src/lib.rs	68.78% (-0.49%)	❗
/chains/orchestrator-relays/runtime/starlight/src/bridge_to_ethereum_config.rs	57.14% (-29.22%)	❗
/chains/orchestrator-relays/runtime/starlight/src/lib.rs	32.88% (-1.07%)	❗
/chains/runtime-common/src/lib.rs	73.91% (+9.62%)	✅

Coverage generated

[girazoki]

yeah from a quick look I see:
pub struct SessionTimer<Delay>(PhantomData<Delay>);
pub struct CandidateHasRegisteredKeys;
BabeSlotBeacon
BabeCurrentBlockRandomnessGetter
BabeGetRandomnessForNextBlock
DanceilghtRegitrarHooks and StarlightRegistrarHooks which likely can be renamed

[ParthDesai]

LGTM