Make Topic and Subscription classes standalone

[cortadocodes]

Summary

Make the Topic and Subscription classes standalone instead of relying on a Service instance and a related subscriber.

Contents (#523)

IMPORTANT: There are 2 breaking changes.

Enhancements

• 💥 BREAKING CHANGE: Remove service argument from Topic constructor
• 💥 BREAKING CHANGE: Remove subscriber argument from Subscription constructor
• Implicitly get Service credentials from environment and remove credentials attribute

Fixes

• Move finally clause to correct nesting level in OrderedMessageHandler.handle_messages

---

Upgrade instructions

💥 Remove `service` argument from `Topic` constructor

Provide the project_name argument instead of the old service argument.

💥 Remove `subscriber` argument from `Subscription` constructor

Remove the old subscriber argument as it's no longer needed.

[codecov-commenter]

Codecov Report

Merging #523 (5d3dadf) into main (a87dd3d) will increase coverage by 0.14%.
The diff coverage is 89.20%.

@@            Coverage Diff             @@
##             main     #523      +/-   ##
==========================================
+ Coverage   93.99%   94.14%   +0.14%     
==========================================
  Files          75       76       +1     
  Lines        3115     3158      +43     
==========================================
+ Hits         2928     2973      +45     
+ Misses        187      185       -2     

Impacted Files	Coverage Δ
octue/cloud/emulators/child.py	97.64% <ø> (ø)
octue/cli.py	83.67% <43.75%> (-5.22%)	⬇️
octue/cloud/pub_sub/topic.py	94.33% <82.35%> (+0.86%)	⬆️
octue/cloud/pub_sub/subscription.py	91.42% <84.61%> (+3.92%)	⬆️
octue/cloud/pub_sub/message_handler.py	97.38% <97.72%> (+0.16%)	⬆️
...ctue/cloud/deployment/google/cloud_run/deployer.py	92.45% <100.00%> (-0.28%)	⬇️
octue/cloud/deployment/google/dataflow/pipeline.py	100.00% <100.00%> (ø)
octue/cloud/emulators/_pub_sub.py	90.83% <100.00%> (+1.94%)	⬆️
octue/cloud/pub_sub/service.py	94.31% <100.00%> (+3.26%)	⬆️
octue/compatibility.py	100.00% <100.00%> (ø)
... and 4 more

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