OZG-6730 Config Refactoring + Get File Endpunkt

.idea/antragraum-proxy.iml

api/gateway-config.yml

cmd/antragsraum-proxy/main.go

config/config.yml

internal/config/config.go

internal/config/config_test.go

internal/config/testdata/test_config.yml

internal/logging/testdata/test_config.yml

internal/mock/testdata/test_config.yml

internal/server/binary_file_router.go

internal/server/command_router.go

internal/server/grpc_router.go

internal/server/handler.go

internal/server/http_gateway.go

internal/server/http_gateway_test.go

internal/server/middleware_test.go

internal/server/testdata/test_config.yml