refactor: Standardize and enhance various components

[chyroc]

• Renamed class static methods to consistently start with build
• Set default expiration time of 900s for jwt oauth token
• Added default empty string value for state parameter in OAuthApp
• Modified some fields in CozeModel to be optional
• Added create_and_poll method to encapsulate chat.create and chat.retrieve

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 90.65421% with 10 lines in your changes missing coverage. Please review.

Project coverage is 98.02%. Comparing base (ebfbc08) to head (6acf830). Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
cozepy/chat/__init__.py	74.35%	10 Missing :warning:

@@            Coverage Diff             @@
##             main      #70      +/-   ##
==========================================
- Coverage   98.34%   98.02%   -0.33%     
==========================================
  Files          38       38              
  Lines        2782     2832      +50     
==========================================
+ Hits         2736     2776      +40     
- Misses         46       56      +10     

Files with missing lines	Coverage Δ
cozepy/auth/__init__.py	93.10% <100.00%> (ø)
cozepy/files/__init__.py	100.00% <100.00%> (ø)
cozepy/knowledge/documents/__init__.py	100.00% <100.00%> (ø)
tests/test_auth.py	100.00% <100.00%> (ø)
tests/test_chat.py	100.00% <100.00%> (ø)
tests/test_chat_message.py	100.00% <100.00%> (ø)
tests/test_conversation_message.py	100.00% <100.00%> (ø)
tests/test_knowledge_documents.py	100.00% <ø> (ø)
cozepy/chat/__init__.py	95.68% <74.35%> (-4.32%)	:arrow_down: