Add Kubernetes deployment and service for Azure AKS

[lkevenson]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: Spring Petclinic Commit Message Guidelines
• All tests are passing (unit, integration, and end-to-end tests where applicable).
• Tests for the changes have been added (for bug fixes / features).
• Docs have been added / updated (for bug fixes / features).
• Code coverage is sufficient, or additional tests have been added to cover new changes.
• No linting or formatting issues.
• Code adheres to the project's style guide and best practices.
• Any necessary dependencies have been updated.

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PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no API changes)
• Build related changes
• CI related changes
• Other... Please describe:

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What is the current behavior?

Issue Number: N/A

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What is the new behavior?

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Does this PR introduce a breaking change?

• Yes
• No

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Other information

• Any additional context or information about the PR (e.g., performance considerations, security impacts, design decisions, etc.).
• Link any related issues (e.g., "Fixes Added findByPetTypeByName and findSpecialtiesByName, caching responses spring-petclinic/spring-petclinic-rest#123" or "Closes #456").
• Provide deployment instructions, if applicable.