Add Google Transcoder API

[modular-magician]

Closes #18328

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_transcoder_job`

`google_transcoder_job_template`

Tests:

 $ make testacc TEST=./google/services/transcoder TESTARGS='-run=TestAccTranscoderJob'
TF_ACC=1 TF_SCHEMA_PANIC_ON_ERROR=1 go test ./google/services/transcoder -v -run=TestAccTranscoderJob -timeout 240m -ldflags="-X=github.com/hashicorp/terraform-provider-google/version.ProviderVersion=acc"
=== RUN   TestAccTranscoderJob_transcoderJobBasicExample
=== PAUSE TestAccTranscoderJob_transcoderJobBasicExample
=== RUN   TestAccTranscoderJobTemplate_transcoderJobTemplateBasicExample
=== PAUSE TestAccTranscoderJobTemplate_transcoderJobTemplateBasicExample
=== RUN   TestAccTranscoderJobTemplate_transcoderJobTemplateOverlaysExample
=== PAUSE TestAccTranscoderJobTemplate_transcoderJobTemplateOverlaysExample
=== RUN   TestAccTranscoderJobTemplate_transcoderJobTemplateEncryptionsExample
=== PAUSE TestAccTranscoderJobTemplate_transcoderJobTemplateEncryptionsExample
=== RUN   TestAccTranscoderJobTemplate_transcoderJobTemplatePubsubExample
=== PAUSE TestAccTranscoderJobTemplate_transcoderJobTemplatePubsubExample
=== CONT  TestAccTranscoderJob_transcoderJobBasicExample
=== CONT  TestAccTranscoderJobTemplate_transcoderJobTemplateEncryptionsExample
=== CONT  TestAccTranscoderJobTemplate_transcoderJobTemplateOverlaysExample
=== CONT  TestAccTranscoderJobTemplate_transcoderJobTemplatePubsubExample
=== CONT  TestAccTranscoderJobTemplate_transcoderJobTemplateBasicExample
--- PASS: TestAccTranscoderJobTemplate_transcoderJobTemplateOverlaysExample (12.78s)
--- PASS: TestAccTranscoderJobTemplate_transcoderJobTemplateBasicExample (12.94s)
--- PASS: TestAccTranscoderJobTemplate_transcoderJobTemplateEncryptionsExample (24.99s)
--- PASS: TestAccTranscoderJob_transcoderJobBasicExample (30.70s)
--- PASS: TestAccTranscoderJobTemplate_transcoderJobTemplatePubsubExample (34.65s)
PASS
ok      github.com/hashicorp/terraform-provider-google/google/services/transcoder       36.049s

Derived from GoogleCloudPlatform/magic-modules#10932