Add ability to get all config as JSON

[maximbircu]

Abstract

For some library, consumers might be useful the ability to get all config info form of a JSON string.

Requirements

• Add a getConfigAsJson method to DevToolsStorage.kt
• Add a filterEnabled parameter so that the library user will be able to filter out the disabled configuration values.

Consumer flow

Usecase 1

1. Go to any source Dev Tools Configuration screen
2. Add val jsonConfiguration = devtools.getAllConfigAsJson() inside the onCreate method
3. Place a breakpoint and check the jsonConfiguration result
4. Make sure the JSON configuration string contains all configuration values

Usecase 2 (Make sure the filter predicate works properly)

1. Go to any source Dev Tools Configuration screen
2. Add val jsonConfiguration = devtools.getAllConfigAsJson { tool -> tool.isEnabled } inside the onCreate method
3. Place a breakpoint and check the jsonConfiguration result
4. Make sure the JSON configuration string contains all enabled configuration values
   You can try and experiment with different filters.