[consensus] Improve "Old" Message Handling

[patrick-ogrady]

Related: #712

TODO:

• Standardize placement of interesting() check
• Why call notify() if not an interesting view?
• Should we just log (and drop) in journal for writing before pruned?
• Add view() to some trait implemented by all types (call interesting on this)

[patrick-ogrady]

Incorporated into #675

[codecov]

Codecov Report

Attention: Patch coverage is 94.91525% with 27 lines in your changes missing coverage. Please review.

Project coverage is 88.71%. Comparing base (e44902f) to head (60e658b).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
consensus/src/threshold_simplex/mocks/outdated.rs	89.55%	14 Missing ⚠️
consensus/src/threshold_simplex/mod.rs	94.16%	8 Missing ⚠️
...onsensus/src/threshold_simplex/actors/voter/mod.rs	98.79%	3 Missing ⚠️
...sensus/src/threshold_simplex/actors/voter/actor.rs	80.00%	2 Missing ⚠️

@@            Coverage Diff             @@
##             main     #713      +/-   ##
==========================================
+ Coverage   88.55%   88.71%   +0.16%     
==========================================
  Files         160      163       +3     
  Lines       38654    39391     +737     
==========================================
+ Hits        34230    34947     +717     
- Misses       4424     4444      +20     

Files with missing lines	Coverage Δ
...s/src/threshold_simplex/actors/resolver/ingress.rs	100.00% <100.00%> (ø)
...nsus/src/threshold_simplex/actors/voter/ingress.rs	100.00% <100.00%> (ø)
...sensus/src/threshold_simplex/actors/voter/actor.rs	93.82% <80.00%> (+0.28%)	⬆️
...onsensus/src/threshold_simplex/actors/voter/mod.rs	98.79% <98.79%> (ø)
consensus/src/threshold_simplex/mod.rs	93.53% <94.16%> (+0.04%)	⬆️
consensus/src/threshold_simplex/mocks/outdated.rs	89.55% <89.55%> (ø)

... and 2 files with indirect coverage changes

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