feat(generative-ai): Add context caching samples (2)

[gericdong]

Description

Fixes b346529113

Add context caching samples part 2:

• use
• get
• update
• delete

Part 1 is in #11871

[snippet-bot[bot]]

Here is the summary of changes.

You are about to add 4 region tags.

- [generative_ai/context_caching/delete_context_cache.py:17](https://github.com/gericdong/edong-python-docs-samples/blob/cb87e87f697f2c6b7e024c7dfe83c71e3adabda6/generative_ai/context_caching/delete_context_cache.py#L17), tag `generativeaionvertexai_gemini_delete_context_cache` - [generative_ai/context_caching/get_context_cache.py:17](https://github.com/gericdong/edong-python-docs-samples/blob/cb87e87f697f2c6b7e024c7dfe83c71e3adabda6/generative_ai/context_caching/get_context_cache.py#L17), tag `generativeaionvertexai_gemini_get_context_cache` - [generative_ai/context_caching/update_context_cache.py:17](https://github.com/gericdong/edong-python-docs-samples/blob/cb87e87f697f2c6b7e024c7dfe83c71e3adabda6/generative_ai/context_caching/update_context_cache.py#L17), tag `generativeaionvertexai_gemini_update_context_cache` - [generative_ai/context_caching/use_context_cache.py:17](https://github.com/gericdong/edong-python-docs-samples/blob/cb87e87f697f2c6b7e024c7dfe83c71e3adabda6/generative_ai/context_caching/use_context_cache.py#L17), tag `generativeaionvertexai_gemini_use_context_cache`

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