docs(compute-samples): added samples and tests for custom machine type

[Sita04]

Added Compute Machine type samples and tests. Docs: https://cloud.google.com/compute/docs/instances/creating-instance-with-custom-machine-type

[snippet-bot[bot]]

Here is the summary of changes.

You are about to add 7 region tags.

• compute/cloud-client/src/main/java/compute/custommachinetype/CreateCustomMachineType.java:19, tag compute_custom_machine_type_create
• compute/cloud-client/src/main/java/compute/custommachinetype/CreateInstanceWithCustomSharedCore.java:19, tag compute_custom_machine_type_create_shared_with_helper
• compute/cloud-client/src/main/java/compute/custommachinetype/CreateWithHelper.java:19, tag compute_custom_machine_type_create_with_helper
• compute/cloud-client/src/main/java/compute/custommachinetype/CreateWithoutHelper.java:19, tag compute_custom_machine_type_create_without_helper
• compute/cloud-client/src/main/java/compute/custommachinetype/ExtraMemoryWithoutHelper.java:19, tag compute_custom_machine_type_extra_mem_no_helper
• compute/cloud-client/src/main/java/compute/custommachinetype/HelperClass.java:19, tag compute_custom_machine_type_helper_class
• compute/cloud-client/src/main/java/compute/custommachinetype/UpdateMemory.java:19, tag compute_custom_machine_type_update_memory

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[Sita04]

Kindly provision these permissions: roles/compute.instanceAdmin.v1 and roles/compute.storageAdmin TIA!

[Shabirmean]

@averikitsch can you review my comments? I think I still need someone reviewing my reviews

[Sita04]

Thanks @Shabirmean for the review. Addressed all your comments. The class structure was supposed to be in the format you suggested. Looks like the auto code linter had other plans :) Thanks for bringing it up!