feat: Add "deno check" subcommand for type checking (#14072)

This commit adds new "deno check" subcommand.
Currently it is an alias for "deno cache" with the difference that remote
modules don't emit TS diagnostics by default.

Prints warning for "deno run" subcommand if "--check" flag is not present
and there's no "--no-check" flag. Adds "DENO_FUTURE_CHECK" env
variable that allows to opt into new behavior now.

cli/tests/integration/check_tests.rs

@@ -0,0 +1,34 @@
+// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
+
+use crate::itest;
+
+itest!(_095_check_with_bare_import {
+  args: "check 095_cache_with_bare_import.ts",
+  output: "095_cache_with_bare_import.ts.out",
+  exit_code: 1,
+});
+
+itest!(check_extensionless {
+  args: "check --reload http://localhost:4545/subdir/no_js_ext",
+  output: "cache_extensionless.out",
+  http_server: true,
+});
+
+itest!(check_random_extension {
+  args: "check --reload http://localhost:4545/subdir/no_js_ext@1.0.0",
+  output: "cache_random_extension.out",
+  http_server: true,
+});
+
+itest!(check_all {
+  args: "check --quiet --remote check_all.ts",
+  output: "check_all.out",
+  http_server: true,
+  exit_code: 1,
+});
+
+itest!(check_all_local {
+  args: "check --quiet check_all.ts",
+  output_str: Some(""),
+  http_server: true,
+});