Regression Benchmark suite (#542)

First version of the sjsonnet regression benchmark suite.

to run: `./mill bench.regressionBenchs`

It takes a while though.

Author: stephenamar-db

bench/resources/README.md

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+# Benchmarks
+
+Run with `./mill bench.regressionBenchs`.
+ 
+## bug_suite
+These contains various examples lifted from sjsonnet bug reports.
+
+## cpp_suite
+These are benchmarks copied from the C++ Jsonnet implementation's test suite.
+Licensed under Apache 2.0, see https://github.com/google/jsonnet/blob/7d1cbf8e69bc8b28e0405080771ccd4da36ac716/LICENSE
+
+## go_suite
+These are benchmarks copied from the Go Jsonnet implementation's test suite.
+Licensed under Apache 2.0, see https://github.com/google/go-jsonnet/blob/10aef6a96ca825c97c87df137a837e39f5df174c/LICENSE

bench/resources/bug_suite/assertions.jsonnet

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+local Obj = {
+  assert std.set(std.objectFields(self)) == std.set(["display_name", "path", "relation"]),
+  display_name: null,
+  path: {
+    assert std.set(std.objectFields(self)) == std.set(["cloud_provider", "cloud_provider_region", "environment"]),
+    cloud_provider: null,
+    cloud_provider_region: null,
+    environment: null,
+  },
+  relation: {
+    assert std.set(std.objectFields(self)) == std.set(["cloud_uri", "environment_uri", "kubernetes_cluster_type_uri", "region_uri", "regulatory_domain_uri"]),
+    cloud_uri: null,
+    environment_uri: null,
+    kubernetes_cluster_type_uri: null,
+    region_uri: null,
+    regulatory_domain_uri: null,
+  }
+};
+
+[
+  Obj {
+    assert true,
+    display_name: "KubernetesCluster %d" % i,
+    path+: {
+      assert true,
+      cloud_provider: "AWS",
+      cloud_provider_region: "AWS_US_EAST_1",
+      environment: "DEV",
+    },
+    relation+: {
+      assert true,
+      cloud_uri: "https://aws.com/cluster/%d" % i,
+      environment_uri: "https://dev.com/environment/%d" % i,
+      kubernetes_cluster_type_uri: "https://kubernetes.com/cluster-type/%d" % i,
+      region_uri: "https://us-east-1.com/region/%d" % i,
+      regulatory_domain_uri: "https://regulatory.com/domain/%d" % i,
+    },
+  }
+  for i in std.range(0, 50)
+]