chore: bump version to 0.2.0.dev0 (#34)

## Summary

Bump the ADP Python SDK version from `0.1.0` to `0.2.0.dev0` in
preparation for the next development cycle.

### Changes
- Updated `version` in `pyproject.toml`
- Updated `__version__` in `src/adp_sdk/__init__.py`

No functional changes.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: mchades

pyproject.toml

@@ -14,7 +14,7 @@
 
 [project]
 name = "adp-sdk"
-version = "0.1.0"
+version = "0.2.0.dev0"
 description = "Agentic Data Protocol (ADP) Python SDK"
 readme = "README.md"
 requires-python = ">=3.10"

src/adp_sdk/__init__.py

@@ -60,7 +60,7 @@
     ValidateResult,
 )
 
-__version__ = "0.1.0"
+__version__ = "0.2.0.dev0"
 
 
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