chore: add Qwen3.5 and Bielik v3.0 models

[barhanc]

Description

Adds symbols for Qwen3.5 and Bielik models.

Introduces a breaking change?

• Yes
• No

Type of change

• Bug fix (change which fixes an issue)
• New feature (change which adds functionality)
• Documentation update (improves or adds clarity to existing documentation)
• Other (chores, tests, code style improvements etc.)

Tested on

• iOS
• Android

Testing instructions

• Run example LLM app and test new models:
  - QWEN3_5_2B_QUANTIZED
  - QWEN3_5_0_8B_QUANTIZED
  - BIELIK_V3_0_1_5B
  - BIELIK_V3_0_1_5B_QUANTIZED
• Check HF pages for the added models:
  - https://huggingface.co/software-mansion/react-native-executorch-qwen-3.5
  - https://huggingface.co/software-mansion/react-native-executorch-bielik-v3.0

Screenshots

Related issues

Closes #935
Closes #1097

Checklist

• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have updated the documentation accordingly
• My changes generate no new warnings

Additional notes