Rename "idle" and "pulled" states

[christoph-blessing]

• Rename the state "idle" to "unshared"
• Rename state "pulled" to "shared"

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (df2167b) 97.12% compared to head (00ceed1) 97.12%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #55   +/-   ##
=======================================
  Coverage   97.12%   97.12%           
=======================================
  Files          28       28           
  Lines         974      974           
  Branches      108      108           
=======================================
  Hits          946      946           
  Misses         16       16           
  Partials       12       12           

Files	Coverage Δ
link/adapters/controller.py	100.00% <100.00%> (ø)
link/adapters/present.py	100.00% <100.00%> (ø)
link/domain/commands.py	100.00% <100.00%> (ø)
link/domain/events.py	100.00% <100.00%> (ø)
link/domain/link.py	93.84% <100.00%> (ø)
link/domain/state.py	95.23% <100.00%> (ø)
link/infrastructure/link.py	96.15% <100.00%> (ø)
link/infrastructure/mixin.py	97.56% <ø> (ø)
link/service/handlers.py	100.00% <100.00%> (ø)

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.