[PARP-155] Implement Maven Central publishing workflow

[MateuszMroz]

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[Copilot]

Pull Request Overview

This PR implements Maven Central publishing workflow by migrating from internal Artifactory deployment to Maven Central publishing, replacing the existing publishing configuration with the Vanniktech Maven Publish plugin.

• Replaces manual maven-publish plugin with com.vanniktech.maven.publish plugin for streamlined Maven Central publishing
• Configures comprehensive POM metadata including project description, licenses, developers, and SCM information
• Implements GPG signing for secure artifact publishing with proper key management

Reviewed Changes

Copilot reviewed 6 out of 7 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
mmd-core/build.gradle.kts	Replaces publishing configuration with Maven Central setup and signing
gradle/libs.versions.toml	Adds Vanniktech Maven Publish plugin dependency
gradle.properties	Bumps library version from 1.0.0 to 1.0.1
.github/workflows/pull-request-android.yml	Updates runner from custom Linux to ubuntu-latest
.github/workflows/library-bump.yml	Updates runner from custom Linux to ubuntu-latest
.github/workflows/deployment.yml	Completely rewrites deployment workflow for Maven Central publishing

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