Add license change trigger for platform.* conan recipes

This commit implements the functionality requested in issue #175:
- Adds a new --new-license command-line parameter
- Creates change_license_in_conanfile_py module to handle license updates
- Applies license changes only to recipes matching pattern ^platform\..+ (case-insensitive)
- Updates license field in conanfile.py with proper quote handling
- Creates separate commit for license changes with descriptive message
- Includes example documentation showing usage

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

Author: konard

examples/test-license-change.md

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+# License Change Feature Test
+
+This document shows how to use the new license change functionality added to the update-conan-recipe-and-create-pull-request tool.
+
+## Usage Example
+
+The tool now accepts a `--new-license` parameter. When provided, it will:
+
+1. Check if the recipe name matches the pattern `platform.*` (case-insensitive)
+2. If it matches, update the `license` field in the `conanfile.py` file
+3. Create a separate commit with the license change
+
+### Command Example
+
+```bash
+./update-conan-recipe-and-create-pull-request \
+  --github-authentication-token "your-token" \
+  --new-version "1.0.0" \
+  --recipe-name "platform.collections" \
+  --source-repo-owner-login "linksplatform" \
+  --source-repo-name "Data.Collections" \
+  --source-repo-branch-name "main" \
+  --destination-repo-owner-login "conan-io" \
+  --destination-repo-name "conan-center-index" \
+  --destination-repo-branch-name "main" \
+  --lib-zip-url "https://example.com/lib.zip" \
+  --sha256hash "abc123..." \
+  --dependencies "[email protected]" \
+  --previous-version "0.9.0" \
+  --new-license "MIT"
+```
+
+### Pattern Matching
+
+The feature only activates for recipes that match the pattern `^platform\..+` (case-insensitive):
+
+- ✅ `platform.collections` → Will change license
+- ✅ `Platform.Memory` → Will change license (case-insensitive)
+- ✅ `platform.data` → Will change license
+- ❌ `boost` → Won't change license
+- ❌ `openssl` → Won't change license
+
+### Implementation Details
+
+The new functionality:
+
+1. Adds a `--new-license` optional command-line parameter
+2. Uses regex pattern `^platform\..+` to match platform-specific recipes
+3. Updates the `license = "value"` line in conanfile.py files
+4. Preserves quote style (single or double quotes)
+5. Creates a separate commit with message "Update license to {new_license}"
+6. Only runs if both conditions are met:
+   - `--new-license` parameter is provided
+   - Recipe name matches the platform pattern