feat: Add iteration support to paginator

[chyroc]

• Added pagination iterator, support synchronous and asynchronous
• Enhanced paginator to support three usage methods:
  1. Use paginator as a regular object, accessing T list via items attribute
  2. Iterate over paginator to get T, ignoring pagination details and retrieving all data
  3. Iterate over iter_pages method to get the paginator itself (i.e., handle pagination)

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 96.77996% with 18 lines in your changes missing coverage. Please review.

Project coverage is 98.33%. Comparing base (ea2f3b4) to head (83775a9). Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
cozepy/model.py	90.95%	18 Missing :warning:

@@            Coverage Diff             @@
##             main      #66      +/-   ##
==========================================
- Coverage   98.81%   98.33%   -0.49%     
==========================================
  Files          38       38              
  Lines        2364     2763     +399     
==========================================
+ Hits         2336     2717     +381     
- Misses         28       46      +18     

Files with missing lines	Coverage Δ
cozepy/__init__.py	100.00% <ø> (ø)
cozepy/bots/__init__.py	100.00% <100.00%> (ø)
cozepy/conversations/message/__init__.py	100.00% <100.00%> (ø)
cozepy/knowledge/documents/__init__.py	100.00% <100.00%> (ø)
cozepy/request.py	98.33% <100.00%> (+0.04%)	:arrow_up:
cozepy/workspaces/__init__.py	100.00% <100.00%> (ø)
tests/test_bot.py	100.00% <100.00%> (ø)
tests/test_conversation_message.py	100.00% <100.00%> (ø)
tests/test_knowledge_documents.py	100.00% <100.00%> (ø)
tests/test_model.py	93.93% <100.00%> (-1.07%)	:arrow_down:
... and 3 more