Feat: Add subtitle delay feature

[anilbeesetti]

No description provided.

[Copilot]

Pull request overview

This PR adds a subtitle delay and speed adjustment feature to the media player by introducing a custom text renderer with offset capabilities. The implementation uses an abstract OffsetRenderer class to handle timing adjustments and integrates it with ExoPlayer through a custom NextTextRenderer.

Changes:

• Introduced OffsetRenderer abstract class to provide time offset and speed adjustment capabilities for renderers
• Implemented NextTextRenderer that extends OffsetRenderer and wraps the default TextRenderer with custom timing logic
• Modified NextRenderersFactory to use the custom NextTextRenderer instead of the default text renderer

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 9 comments.

File	Description
media3ext/src/main/java/io/github/anilbeesetti/nextlib/media3ext/rendrer/OffsetRenderer.kt	New abstract class providing timing offset/speed adjustment functionality with helper extension function
media3ext/src/main/java/io/github/anilbeesetti/nextlib/media3ext/rendrer/NextTextRenderer.kt	Custom text renderer implementation with ExoPlayer extension properties for subtitle delay and speed control
media3ext/src/main/java/io/github/anilbeesetti/nextlib/media3ext/ffdecoder/NextRenderersFactory.kt	Override of buildTextRenderers() to integrate the custom NextTextRenderer

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