feat(terraform): Implement terraform lock files (#10469)

docs/usage/self-hosted-experimental.md

...rce/terraform-provider/__fixtures__/azurerm-provider.json

.../terraform-provider/__fixtures__/releaseBackendIndex.json

...ource/terraform-provider/__snapshots__/index.spec.ts.snap

lib/datasource/terraform-provider/index.ts

lib/datasource/terraform-provider/types.ts

lib/manager/terraform/index.ts

...m/lockfile/__fixtures__/releaseBackendAzurerm_2_56_0.json

lib/manager/terraform/lockfile/__fixtures__/test.zip

...manager/terraform/lockfile/__fixtures__/validLockfile.hcl

...anager/terraform/lockfile/__snapshots__/hash.spec.ts.snap

...nager/terraform/lockfile/__snapshots__/index.spec.ts.snap

...anager/terraform/lockfile/__snapshots__/util.spec.ts.snap

lib/manager/terraform/lockfile/hash.spec.ts

lib/manager/terraform/lockfile/hash.ts

lib/manager/terraform/lockfile/index.spec.ts

lib/manager/terraform/lockfile/index.ts

lib/manager/terraform/lockfile/types.ts

lib/manager/terraform/lockfile/util.spec.ts

lib/manager/terraform/lockfile/util.ts