Initial transfer of bigqueryreservation assignment into tpgtools

[melinath]

Related to hashicorp/terraform-provider-google#6694

If this PR is for Terraform, I acknowledge that I have:

• Searched through the issue tracker for an open issue that this either resolves or contributes to, commented on it to claim it, and written "fixes {url}" or "part of {url}" in this PR description. If there were no relevant open issues, I opened one and commented that I would like to work on it (not necessary for very small changes).
• Generated Terraform, and ran make test and make lint to ensure it passes unit and linter tests.
• Ensured that all new fields I added that can be set by a user appear in at least one example (for generated resources) or third_party test (for handwritten resources or update tests).
• Ran relevant acceptance tests (If the acceptance tests do not yet pass or you are unable to run them, please let your reviewer know).
• Read the Release Notes Guide before writing my release note below.

Release Note Template for Downstream PRs (will be copied)

`google_bigquery_reservation_assignment`

[modular-magician]

Hi! I'm the modular magician. Your PR generated some diffs in downstreams - here they are.

Diff report:

Terraform GA: Diff ( 5 files changed, 413 insertions(+))
Terraform Beta: Diff ( 5 files changed, 413 insertions(+))

[modular-magician]

Hi! I'm the modular magician. Your PR generated some diffs in downstreams - here they are.

Diff report:

Terraform GA: Diff ( 6 files changed, 423 insertions(+))
Terraform Beta: Diff ( 7 files changed, 424 insertions(+), 2 deletions(-))

[modular-magician]

Hi! I'm the modular magician. Your PR generated some diffs in downstreams - here they are.

Diff report:

Terraform GA: Diff ( 6 files changed, 444 insertions(+))
Terraform Beta: Diff ( 6 files changed, 444 insertions(+))

[modular-magician]

Error trying to cancel build ()

[modular-magician]

Error trying to cancel build ()

[modular-magician]

Error trying to cancel build ()

[modular-magician]

Error trying to cancel build ()

[modular-magician]

Error trying to cancel build ()

[modular-magician]

Hi! I'm the modular magician. Your PR generated some diffs in downstreams - here they are.

Diff report:

Terraform GA: Diff ( 6 files changed, 444 insertions(+))
Terraform Beta: Diff ( 7 files changed, 445 insertions(+), 1 deletion(-))

[modular-magician]

I have triggered VCR tests in RECORDING mode for the following tests that failed during VCR: TestAccBigqueryReservationReservationAssignment_bigqueryReservationAssignmentBasic|TestAccComputeInstanceFromMachineImage_basic|TestAccComputeInstanceFromMachineImage_overrideMetadataDotStartupScript|TestAccPrivatecaCaPool_privatecaCapoolEmptyBaseline|TestAccPrivatecaCertificateTemplate_BasicCertificateTemplate|TestAccTags You can view the result here: https://ci-oss.hashicorp.engineering/viewQueued.html?itemId=202837

[modular-magician]

Tests failed during RECORDING mode: TestAccPrivatecaCaPool_privatecaCapoolEmptyBaseline|TestAccBigqueryReservationReservationAssignment_bigqueryReservationAssignmentBasic Please fix these to complete your PR

[melinath]

Where this is currently at:

• it's able to create but not delete resources, because the id getting stored is wrong.
• We probably need to start using DCL resource ID() across the board in order for this to work properly.
• There is also probably going to still be a permadiff due to location not being set on the resource - maybe we need to extract all the fields from the dcl resource?

[melinath]

This was done elsewhere