Guard short BLE parser payloads

[IoannisArmamentos]

Summary

Add missing payload-length validation to several BLE parsers.

Problem

The Sensirion, Almendo, and RuuviTag parsers could receive truncated manufacturer data that passed the shared dispatcher but was still too short for direct indexing or struct.unpack() calls.

Depending on the parser and payload length, this could result in exceptions such as:

• IndexError
• ValueError
• struct.error

Fix

Add parser specific length validation before accessing fields that require a minimum payload size.

The checks are kept format-specific where necessary, especially for RuuviTag V3 and V5 payloads, so valid shorter formats are not rejected.

Regression tests cover truncated advertisements while preserving existing valid parsing behavior.