Round of dependency updates

[gchristov]

What does this pull request change?

This PR addresses #22:

• introduces Gradle version catalogs
• updates to latest Gradle and AGP
• updates all dependencies to latest versions
• fixes up stuff after the dependency updates
• removes unneeded AndroidManifests
• introduces an umbrella di module which is used to expose all dependencies to the client apps
• adds a new gradle-plugins/conventions module and modernises the composite build
• modernises the Kotlin Multiplatform build setup
• updates the dependency injection setup
• adds Kermit the log
• updates NetworkClient setup
• fixes Kotlinx serialisation and enables it for all newsfeed-mpl-modules
• updates the feed-data and post-data modules to use Longs rather than Ints for SQLDeight to avoid complexity

How is this change tested?

Manually and with existing checks.

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Writing Kotlin Multiplatform tests