feat(unstable): Workspaces support (#20410)

This commit adds unstable workspace support. This is extremely
bare-bones and
minimal first-pass at this.

With this change `deno.json` supports specifying `workspaces` key, that
accepts a list of subdirectories. Each workspace can have its own import
map. It's required to specify a `"name"` and `"version"` properties in the
configuration file for the workspace:

```jsonc
// deno.json
{
  "workspaces": [
     "a",
     "b"
  },
  "imports": {
    "express": "npm:express@5"
   }
}
```
``` jsonc
// a/deno.json
{
  "name": "a",
  "version": "1.0.2",
  "imports": {
    "kleur": "npm:kleur"
  }
}
```
```jsonc
// b/deno.json
{
  "name": "b",
  "version": "0.51.0",
  "imports": {
    "chalk": "npm:chalk"
  }
}
```

`--unstable-workspaces` flag is required to use this feature:
```
$ deno run --unstable-workspaces mod.ts
```

---------

Co-authored-by: David Sherret <dsherret@gmail.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/cli/args/import_map.rs b/cli/args/import_map.rs
index 9d1b2bbda..5ebb425eb 100644
--- a/cli/args/import_map.rs
+++ b/cli/args/import_map.rs
@@ -36,7 +36,7 @@ pub async fn resolve_import_map_from_specifier(
   import_map_from_value(specifier, value)
 }
 
-fn import_map_from_value(
+pub fn import_map_from_value(
   specifier: &Url,
   json_value: serde_json::Value,
 ) -> Result<ImportMap, AnyError> {