fix(pdk) kong.response.get_source() to return error on plugin throws runtime exception

[ms2008]

Summary

If plugin that throws runtime exception on access phase, kong.response.get_source() should returned error instead of exit.

FTI-3200

[CLAassistant]

All committers have signed the CLA.

[dndx]

Looks reasonable, can we add a test case using severless-plugin?

[andreleoni]

This change context should be by plugin, instead of all application initializer?

In my opinion, if a error was received, the application should exit, instead of only log an error, should be dangerous only log an error...

🤔

[ms2008]

This change context should be by plugin, instead of all application initializer?

In my opinion, if a error was received, the application should exit, instead of only log an error, should be dangerous only log an error...

🤔

In access phase we need to run through the whole plugin iterator to get list of plugins for the request. You cannot exit it while looping. We need to collect the plugins even in case of an error.