refactor(iotda): refactor iotda space resource code style

[ruwenqiang123]

What this PR does / why we need it:

refactor iotda space resource code style.

Which issue this PR fixes:
(optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close that issue when PR gets merged)
fixes #xxx

Special notes for your reviewer:

Release note:

PR Checklist

• Tests added/passed.

$ make testacc TEST="./huaweicloud/services/acceptance/iotda" TESTARGS="-run TestAccSpace_basic"
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./huaweicloud/services/acceptance/iotda -v -run TestAccSpace_basic -timeout 360m -parallel 4
=== RUN   TestAccSpace_basic
--- PASS: TestAccSpace_basic (39.20s)
PASS
ok      github.com/huaweicloud/terraform-provider-huaweicloud/huaweicloud/services/acceptance/iotda     39.250s

• Documentation updated.

• Schema updated.

• CheckDeleted.

  • a. During query operation (Read Context)
    aa. Resource not found
    >>>>>> Paste the screenshot here <<<<<<
    
  • b. During delete/disassociate/unbind operation (Delete Context)
    ba. Resource not found
    >>>>>> Paste the screenshot here <<<<<<
    

[jinyangyang222]

/lgtm

[deer-hang]

/approve

[github-ci-robot]

This PR has been approved by: @deer-hang

/approve