Add schema resource

[jialei-chen]

This PR adds a new resource Schema to product DiscoveryEngine (b/340925271).

Release Note Template for Downstream PRs (will be copied)

`google_discovery_engine_schema`

[modular-magician]

Hi there, I'm the Modular magician. I've detected the following information about your changes:

Diff report

Your PR generated some diffs in downstreams - here they are.

google provider: Diff ( 5 files changed, 788 insertions(+), 2 deletions(-))
google-beta provider: Diff ( 5 files changed, 788 insertions(+), 2 deletions(-))
terraform-google-conversion: Diff ( 1 file changed, 69 insertions(+))
Open in Cloud Shell: Diff ( 4 files changed, 117 insertions(+))

[modular-magician]

Tests analytics

Total tests: 17
Passed tests: 8
Skipped tests: 0
Affected tests: 1

Click here to see the affected service packages

• discoveryengine

Action taken

Found 1 affected test(s) by replaying old test recordings. Starting RECORDING based on the most recent commit. Click here to see the affected tests

• TestAccDiscoveryEngineSchema_discoveryengineSchemaBasicExample

Get to know how VCR tests work

[modular-magician]

$\textcolor{red}{\textsf{Tests failed during RECORDING mode:}}$
TestAccDiscoveryEngineSchema_discoveryengineSchemaBasicExample[Error message] [Debug log]

$\textcolor{red}{\textsf{Errors occurred during RECORDING mode. Please fix them to complete your PR.}}$

View the build log or the debug log for each test

[modular-magician]

Hi there, I'm the Modular magician. I've detected the following information about your changes:

Diff report

Your PR generated some diffs in downstreams - here they are.

google provider: Diff ( 5 files changed, 788 insertions(+), 2 deletions(-))
google-beta provider: Diff ( 5 files changed, 788 insertions(+), 2 deletions(-))
terraform-google-conversion: Diff ( 1 file changed, 69 insertions(+))
Open in Cloud Shell: Diff ( 4 files changed, 117 insertions(+))

[modular-magician]

Tests analytics

Total tests: 17
Passed tests: 8
Skipped tests: 0
Affected tests: 1

Click here to see the affected service packages

• discoveryengine

Action taken

Found 1 affected test(s) by replaying old test recordings. Starting RECORDING based on the most recent commit. Click here to see the affected tests

• TestAccDiscoveryEngineSchema_discoveryengineSchemaBasicExample

Get to know how VCR tests work

[modular-magician]

$\textcolor{red}{\textsf{Tests failed during RECORDING mode:}}$
TestAccDiscoveryEngineSchema_discoveryengineSchemaBasicExample[Error message] [Debug log]

$\textcolor{red}{\textsf{Errors occurred during RECORDING mode. Please fix them to complete your PR.}}$

View the build log or the debug log for each test