Support field lookup by field.id as fallback to field.label

[AlonNaor22]

Summary

• Extends load_dict and load to resolve fields by field.id when a field.label match is not found
• Lookup order: label first → id second → raise error (as described in load_dict and load work with field id and label #50)
• Section lookup also extended to support both section.label and section.id

Files changed

• src/onepasswordconnectsdk/config.py — extracted reusable _find_field() and _match_field() helpers, added FIELD_MATCH_ATTRIBUTES constant for configurable lookup order, extended _convert_sections_to_dict() to support section id keys
• src/tests/test_config.py — 3 new tests: field id lookup via load_dict, field id lookup via load, and label-takes-priority verification

Test plan

• Existing test_load and test_load_dict still pass (no regressions)
• test_load_dict_by_field_id — verifies field.id fallback with load_dict
• test_load_by_field_id — verifies field.id fallback with load
• test_load_dict_label_takes_priority — verifies label match wins over id match

Note: Some pre-existing async tests in test_client_items.py and test_client_vaults.py fail due to a missing pytest-asyncio dependency — are these expected to pass? Our changes don't touch those files.

Closes #50

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