impl trust anchor trait

[Robert-Steiner]

Cherry-pick trust anchor trait + implementation into the state machine from #636

• applied review comments

[codecov]

Codecov Report

Merging #682 (52aed60) into master (0e0a93e) will increase coverage by 0.04%.
The diff coverage is 85.71%.

@@            Coverage Diff             @@
##           master     #682      +/-   ##
==========================================
+ Coverage   62.95%   63.00%   +0.04%     
==========================================
  Files          97       98       +1     
  Lines        4430     4446      +16     
==========================================
+ Hits         2789     2801      +12     
- Misses       1641     1645       +4     

Impacted Files	Coverage Δ
rust/xaynet-server/src/state_machine/mod.rs	75.00% <ø> (ø)
...ver/src/storage/coordinator_storage/redis/impls.rs	72.72% <0.00%> (ø)
...erver/src/storage/coordinator_storage/redis/mod.rs	71.20% <ø> (ø)
rust/xaynet-server/src/storage/traits.rs	66.66% <ø> (ø)
rust/xaynet-server/src/storage/store.rs	80.00% <72.72%> (-4.10%)	⬇️
...t/xaynet-server/src/state_machine/phases/unmask.rs	58.33% <75.00%> (+0.12%)	⬆️
...st/xaynet-server/src/state_machine/phases/error.rs	75.00% <80.00%> (ø)
rust/xaynet-server/src/settings/mod.rs	92.18% <100.00%> (+0.12%)	⬆️
...ust/xaynet-server/src/state_machine/initializer.rs	82.50% <100.00%> (ø)
...ust/xaynet-server/src/state_machine/phases/idle.rs	73.68% <100.00%> (ø)
... and 8 more

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[janpetschexain]

the reduction of generic type parameters to be carried around is pretty nice 👍