provider/fastly: Add support for Cache Settings

[catsby]

Add support for using Cache Settings in Fastly:

• https://docs.fastly.com/guides/conditions/using-conditions#create-a-cache-settings-object-and-its-condition
• https://docs.fastly.com/api/config#cache_settings

TF_ACC=1 go test ./builtin/providers/fastly -v -run=TestAccFastlyService -timeout 120m
=== RUN   TestAccFastlyServiceV1CacheSetting_basic
--- PASS: TestAccFastlyServiceV1CacheSetting_basic (36.24s)
=== RUN   TestAccFastlyServiceV1_conditional_basic
--- PASS: TestAccFastlyServiceV1_conditional_basic (14.48s)
=== RUN   TestAccFastlyServiceV1_gzips_basic
--- PASS: TestAccFastlyServiceV1_gzips_basic (33.62s)
=== RUN   TestAccFastlyServiceV1_headers_basic
--- PASS: TestAccFastlyServiceV1_headers_basic (33.37s)
=== RUN   TestAccFastlyServiceV1RequestSetting_basic
--- PASS: TestAccFastlyServiceV1RequestSetting_basic (15.22s)
=== RUN   TestAccFastlyServiceV1_s3logging_basic
--- PASS: TestAccFastlyServiceV1_s3logging_basic (31.90s)
=== RUN   TestAccFastlyServiceV1_s3logging_s3_env
--- PASS: TestAccFastlyServiceV1_s3logging_s3_env (15.72s)
=== RUN   TestAccFastlyServiceV1_updateDomain
--- PASS: TestAccFastlyServiceV1_updateDomain (35.16s)
=== RUN   TestAccFastlyServiceV1_updateBackend
--- PASS: TestAccFastlyServiceV1_updateBackend (33.98s)
=== RUN   TestAccFastlyServiceV1_basic
--- PASS: TestAccFastlyServiceV1_basic (13.29s)
=== RUN   TestAccFastlyServiceV1_disappears
--- PASS: TestAccFastlyServiceV1_disappears (9.03s)
=== RUN   TestAccFastlyServiceV1_VCL_basic
--- PASS: TestAccFastlyServiceV1_VCL_basic (33.00s)
PASS
ok      github.com/hashicorp/terraform/builtin/providers/fastly 305.013s

[phinze]

LGTM! 👍 🎆

[ghost]

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