add debug method (dump_raw) to dump internal data / page structures

[IzzySoft]

This PR adds a new method dump_raw() allowing to dump the resources:

• the full source retrieved from Google servers
• one JSON file per embedded data source

Seemed helpful to me when debugging things or looking at how to add new features (without placing all kinds of print commands into the class file every time :wink:)

[IzzySoft]

OK, ds:2 (never encountered with data yet) & ds:4 (icon, featureGraphic, video.txt) seem often to be empty, all others should be dumped now:

• ds:0 categories of this app
• ds:1 account links (library, payments, my play activity, offers, settings)
• ds:2 (not yet encountered, so no idea)
• ds:3 links to the app in other languages (i.e. the base link with ?hl=XX&gl=ZZ appended)
• ds:4 featureGraphic, video (often missing on 1st call)
• ds:5 age rating (PG) etc
• ds:6 developer data? other apps etc.
• ds:7 Reviews
• ds:8 Google TOS?
• ds:9 ? Play Pass, Play Points, Gift cards, Refund policy, Parent Guide, Family Sharing …

ds:1, ds:8 & ds:9 seem to be identical for (most|all|many) apps (naturally).

[IzzySoft]

@BaseMax may I kindly ask to merge, so our code bases are not getting out of sync? Or are you opposed to merging it?

[BaseMax]

Hi Izzy, sorry for the delay. It seems I missed your updates here. And thanks for recalling it for me. Merged. Best

[IzzySoft]

Hehe, happens. Thanks for the merge!