Fix Android plugin filename casing so builds work on case-sensitive filesystems

[mthlemos]

Fixes #105.

Problem

On case-sensitive filesystems (Linux, so most Docker images and CI runners), flutter build fails with:

The plugin `blinkid_flutter` doesn't have a main class defined in
.../com/microblink/blinkid/flutter/BlinkIdFlutterPlugin.java or
.../com/microblink/blinkid/flutter/BlinkIdFlutterPlugin.kt.

pubspec.yaml declares pluginClass: BlinkIdFlutterPlugin, but the file on disk was named BlinkidFlutterPlugin.kt, with a lowercase i and d. The Kotlin class inside the file was already spelled correctly, so only the filename was wrong.

Flutter resolves the main class through an exact, case-sensitive path lookup derived from pluginClass. It does not scan the directory. macOS (APFS) and Windows (NTFS) silently tolerate the mismatch, which is why this never showed up in local development.

This reproduces on both 8000.0.0 and 8001.0.0.

Change

Three renames under BlinkID/android/src/main/kotlin/com/microblink/blinkid/flutter/, with no content changes:

• BlinkidFlutterPlugin.kt → BlinkIdFlutterPlugin.kt
• BlinkidDeserializationUtils.kt → BlinkIdDeserializationUtils.kt
• BlinkidSerializationUtils.kt → BlinkIdSerializationUtils.kt

Only the first rename fixes the bug. The other two were just renamed for consistency.

[coderabbitai]

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💤 Files selected but had no reviewable changes (3)

• BlinkID/android/src/main/kotlin/com/microblink/blinkid/flutter/BlinkIdDeserializationUtils.kt
• BlinkID/android/src/main/kotlin/com/microblink/blinkid/flutter/BlinkIdFlutterPlugin.kt
• BlinkID/android/src/main/kotlin/com/microblink/blinkid/flutter/BlinkIdSerializationUtils.kt

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Reviewing files that changed from the base of the PR and between 3c1c068 and b4ffc82.

📒 Files selected for processing (3)

• BlinkID/android/src/main/kotlin/com/microblink/blinkid/flutter/BlinkIdDeserializationUtils.kt
• BlinkID/android/src/main/kotlin/com/microblink/blinkid/flutter/BlinkIdFlutterPlugin.kt
• BlinkID/android/src/main/kotlin/com/microblink/blinkid/flutter/BlinkIdSerializationUtils.kt

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