feat: Expand 'imports' section of deno.json (#22087)

This commit adds automatic expansion of "imports" field in "deno.json"
file.

If "npm:" or "jsr:" imports are encountered we automatically try to add
a "directory" remapping.

Previously users had to specify entries for both `foo` and `foo/` to be
able to import like
`import { symbol1 } from "foo";` and `import { symbol2 } from
"foo/some_file.js"`:
```
{
  "imports": {
    "foo": "npm:@foo/bar",
    "foo/": "npm:/@foo/bar/",
}
```

With this change users can only add entry for `foo`:
```
{
  "imports": {
    "foo": "npm:@foo/bar",
}
```
The entry for `foo/` will be provided automatically.

Similarly if user provides "directory" remapping explicitly, we will not
overwrite it.

1 files changed, 1 insertions, 1 deletions

diff --git a/cli/tests/testdata/compile/npm_fs/main.ts b/cli/tests/testdata/compile/npm_fs/main.ts
index f9951d7a4..6361610a9 100644
--- a/cli/tests/testdata/compile/npm_fs/main.ts
+++ b/cli/tests/testdata/compile/npm_fs/main.ts
@@ -154,7 +154,7 @@ await assert.rejects(
 }
 
 // read dir
-const readDirNames = ["main.d.mts", "main.mjs", "package.json"];
+const readDirNames = ["main.d.mts", "main.mjs", "other.mjs", "package.json"];
 {
   const names = Array.from(Deno.readDirSync(dirPath))
     .map((e) => e.name);