Add DaVinci flow support to PingOne MFA sample app

[EvgeniyMish]

JIRA Ticket

P14C-82519

Description

Summary

This MR extends the PingOne MFA sample app with DaVinci integration. It adds a DaVinci launcher, editable DaVinci environment configurations, and flow rendering that supports PingOne MFA-specific collectors for mobile payload collection and device pairing.

Changes

Added :davinci module dependency to samples:pingonemfapp.
Added DaVinci configuration management:
Default payload and pairing flow configurations.
Editable client ID, discovery endpoint, scopes, redirect URI, display name, timeout, and storage file name.
JSON persistence through SharedPreferences.
Added DaVinci launcher flow from the app drawer.
Added DaVinci flow screen and ViewModel for starting flows, advancing nodes, and handling success/error/failure states.
Added PingOne MFA-specific DaVinci collector handling:
device-payload collector calls PingOneMFA.collectMobilePayload().
device-pairing-code collector calls PingOneMFA.pair(...).
Retry and submit UI handling around collector state.
Reworked app navigation to use a shared drawer with Accounts, Launch DaVinci, Settings, and About.
Removed the old login screen.
Added reusable UI components for alerts, retry, and submit buttons.
Updated strings and README documentation to describe the new DaVinci sample flows.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
⚠️ Please upload report for BASE (mfa-proxy-poc@4e0db63). Learn more about missing BASE report.

Additional details and impacted files

@@               Coverage Diff                @@
##             mfa-proxy-poc     #189   +/-   ##
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  Coverage                 ?   28.20%           
  Complexity               ?      864           
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  Files                    ?      291           
  Lines                    ?     9316           
  Branches                 ?     1182           
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  Hits                     ?     2628           
  Misses                   ?     6433           
  Partials                 ?      255           

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unit-tests	28.20% <ø> (?)

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