Add array native access

[igorT]

Allows managed arrays to be used as native JS arrays. Removes PROXY_MODEL_CLASS feature flag, due to a different implementation for object dot access compared to the one that was feature flagged.

[github-actions]

Performance Report for 3a5b7a4

Scenario - materializing: ✅ Performance improved

✅ duration
phase estimated improvement -77ms [-126ms to -28ms] OR -1.03% [-1.69% to -0.38%]
☑️ Phase [navigationStart] => [start-loading]
phase no difference [-7ms to 3ms]
☑️ Phase [start-loading] => [pushed-payload]
phase no difference [-11ms to 30ms]
✅ Phase [pushed-payload] => [end-loading]
phase estimated improvement -78ms [-112ms to -47ms] OR -2.61% [-3.76% to -1.57%]
☑️ Phase [end-loading] => [Test End]
phase no difference [-4ms to 4ms]

Scenario - rendering: ☑️ Performance is stable

☑️ duration
phase no difference [-12ms to 21ms]
☑️ Phase [navigationStart] => [start-loading]
phase no difference [-3ms to 6ms]
⚠️ Phase [start-loading] => [pushed-payload]
phase estimated regression +2ms [1ms to 3ms] OR +1.69% [0.64% to 2.82%]
☑️ Phase [pushed-payload] => [end-loading]
phase no difference [0ms to 0ms]
☑️ Phase [end-loading] => [Test End]
phase no difference [-12ms to 14ms]

[gitstevenpham]

lgtm