Add support for ECS Anywhere

docs/content/providers/ecs.md

docs/content/reference/static-configuration/cli-ref.md

docs/content/reference/static-configuration/env-ref.md

docs/content/reference/static-configuration/file.toml

docs/content/reference/static-configuration/file.yaml

pkg/provider/ecs/config.go

pkg/provider/ecs/ecs.go

pkg/redactor/redactor_config_test.go

pkg/redactor/testdata/anonymized-static-config.json