QgsFeature python optimisations

[nyalldawson]

Optimise some more frequently called methods for use in PyQGIS

[github-actions]

🪟 Windows builds ready!

Windows builds of this PR are available for testing here. Debug symbols for this build are available here.

(Built from commit 5ccd7e2)

[ptitjano]

@nyalldawson Thanks. Have you been able to test it and measure the improvement?

[nyalldawson]

@ptitjano

Have you been able to test it and measure the improvement?

With a similar test to the loop from #57470, calling 10.5 million times

Before:
18.3s

After:
16.4s

With the optimisations from #57470:

Before (#57470 alone):
12.8s

After (this + #57470):
11.7s

So no where near as dramatic as #57470, but still worthwhile!

[nyalldawson]

@troopa81 good to merge now?