add 'from ndjson' into standard library (#10283)

close #8574
related #10276 
# Description

added below into standard library
```
def "from ndjson" []: string -> any {
    from json --objects
}
```

# User-Facing Changes


Users can use functions like "from ndjson" in standard library, and can
open ndjson files with `open` command.
```
use std formats *
# `from ndjson` is available now
open sample.ndjson
```

# Tests + Formatting

`toolkit check pr`

- 🟢 `toolkit fmt`
- 🟢 `toolkit clippy`
- 🟢 `toolkit test`
- 🟢 `toolkit test stdlib`


# After Submitting

---------

Co-authored-by: Stefan Holderbach <sholderbach@users.noreply.github.com>

crates/nu-std/std/formats.nu

@@ -0,0 +1,20 @@
+# formats.nu
+#
+# This file contains functions for formatting data in various ways.
+#
+# Usage:
+#   use std format *
+#   use std format <function name>
+#
+# These functions help `open` the files with unsupported extensions such as ndjson.
+#
+
+# Convert from ndjson to structured data.
+export def "from ndjson" []: string -> any {
+    from json --objects
+}
+
+# Convert from jsonl to structured data.
+export def "from jsonl" []: string -> any {
+    from json --objects
+}