Added resource and data source for aws ec2 capacity block reservation.

[prabhavpawar]

Description
This PR adds a resource for aws_ec2_capacity_block_reservation and data-source for aws_ec2_capacity_block_offering. With Capacity Blocks, GPU instance capacity is available on future dates, and a Capacity Block can be scheduled to start at a time.

Relations
Closes #35358

References
Capacity Block Docs

Output from Acceptance Testing

TF_ACC=1 /opt/devshell/go/latest/bin/go test  internal/service/ec2/ec2_capacity_block_offering_data_source_test.go -v  -count 1 -parallel 1 -run=TestAccEC2CapacityBlockOffering_basic
=== RUN   TestAccEC2CapacityBlockOffering_basic
=== PAUSE TestAccEC2CapacityBlockOffering_basic
=== CONT  TestAccEC2CapacityBlockOffering_basic
--- PASS: TestAccEC2CapacityBlockOffering_basic (27.46s)
PASS
ok  command-line-arguments  29.812s

TF_ACC=1 /opt/devshell/go/latest/bin/go test  internal/service/ec2/ec2_capacity_block_reservation_test.go -v  -count 1 -parallel 1 -run=TestAccEC2CapacityBlockReservation_basic
=== RUN   TestAccEC2CapacityBlockReservation_basic
=== PAUSE TestAccEC2CapacityBlockReservation_basic
=== CONT  TestAccEC2CapacityBlockReservation_basic
    ec2_capacity_block_reservation_test.go:37: Step 1/1 error: Error running apply: exit status 1
        Error: creating EC2 Capacity Reservation: UnauthorizedOperation: You are not authorized to perform this operation. User: arn:aws:sts::878176493429:assumed-role/90467-application-engineer/O664318@ASIAPAC.AD.JPMORGANCHASE.com is not authorized to perform: ec2:PurchaseCapacityBlock on resource: arn:aws:ec2:us-west-2:878176493429:capacity-reservation/* because no identity-based policy allows the ec2:PurchaseCapacityBlock action. Encoded authorization failure message: ...
        	status code: 403, request id: 99a38e9a-cb56-4ec4-9dc8-b33eb5a4026e
          with aws_ec2_capacity_block_reservation.test,
          on terraform_plugin_test.tf line 20, in resource "aws_ec2_capacity_block_reservation" "test":
          20: resource "aws_ec2_capacity_block_reservation" "test" {
--- FAIL: TestAccEC2CapacityBlockReservation_basic (18.76s)
FAIL
FAIL	command-line-arguments	21.122s
FAIL

[github-actions]

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[github-actions]

Welcome @prabhavpawar 👋

It looks like this is your first Pull Request submission to the Terraform AWS Provider! If you haven’t already done so please make sure you have checked out our CONTRIBUTOR guide and FAQ to make sure your contribution is adhering to best practice and has all the necessary elements in place for a successful approval.

Also take a look at our FAQ which details how we prioritize Pull Requests for inclusion.

Thanks again, and welcome to the community! 😃