[Improvement] Fix typos and unnecessary memory allocation in native engine

[Deegue]

Describe the bug / improvement

There are a few minor code issues in the native engine:

1. Typos in pb_deserializer.rs

• "output scheam" should be "output schema"
• "not exits" should be "not exists"

2. Many places withexpect(&format!(...)) always allocate memory for the strings even the value is some or ok

Expected behavior

Spell correctly, and expect should not perform any unnecessary allocation