strictFuncs+views: add test that imports stdlib modules (#16878)

This commit attempts to improve testing of strictFuncs and views, and
prevent regressions like #16873 (resolved by 0b01eddace).

We previously only explicitly tested strictFuncs and views with a
smaller number of stdlib modules, mostly in:
- tests/effects/tstrict_funcs.nim
- tests/views/tcan_compile_nim.nim

Note that this commit leaves the `pegs` module commented out; it
cannot currently be compiled with `--experimental:views` (see #16892).

Note also that this commit is not sufficient to test strictFuncs and
views, but it does detect a subset of problems.

tests/effects/tstrict_funcs_imports_js.nim

@@ -0,0 +1,21 @@
+discard """
+  cmd: "nim $target $options --hints:on --experimental:strictFuncs --experimental:views $file"
+  targets: "js"
+"""
+{.warning[UnusedImport]: off.}
+
+import
+  asyncjs,
+  dom,
+  dom_extensions,
+  jsconsole,
+  jsffi,
+  jsre
+
+import std/[
+  jsbigints,
+]
+
+import std/private/[
+  jsutils,
+]