Move some from xxx commands to plugin (#7942)

# Description

From nushell 0.8 philosophy:
https://github.com/nushell/nushell.github.io/blob/main/contributor-book/philosophy_0_80.md#core-categories

> The following categories should be moved to plugins:
Uncommon format support

So this pr is trying to move following commands to plugin:
- [X] from eml
- [x] from ics
- [x] from ini
- [x] from vcf

And we can have a new plugin handles for these formatting, currently
it's implemented here:

https://github.com/WindSoilder/nu_plugin_format

The command usage should be the same to original command.

If it's ok, the plugin can support more formats like
[parquet](https://github.com/fdncred/nu_plugin_from_parquet), or [EDN
format](https://github.com/nushell/nushell/issues/6415), or something
else.

Just create a draft pr to show what's the blueprint looks like, and is
it a good direction to move forward?

# User-Facing Changes

_(List of all changes that impact the user experience here. This helps
us keep track of breaking changes.)_

# Tests + Formatting

Don't forget to add tests that cover your changes.

Make sure you've run and fixed any issues with these commands:

- `cargo fmt --all -- --check` to check standard code formatting (`cargo
fmt --all` applies these changes)
- `cargo clippy --workspace -- -D warnings -D clippy::unwrap_used -A
clippy::needless_collect` to check that you're using the standard code
style
- `cargo test --workspace` to check that all tests pass

# After Submitting

If your PR had any user-facing changes, update [the
documentation](https://github.com/nushell/nushell.github.io) after the
PR is merged, if necessary. This will help us keep the docs up to date.

crates/nu-command/tests/commands/open.rs

@@ -188,26 +188,6 @@ fn parses_xml() {
     )
 }
 
-#[test]
-fn parses_ini() {
-    let actual = nu!(
-        cwd: "tests/fixtures/formats",
-        "open sample.ini | get SectionOne.integer"
-    );
-
-    assert_eq!(actual.out, "1234")
-}
-
-#[test]
-fn parses_utf16_ini() {
-    let actual = nu!(
-        cwd: "tests/fixtures/formats",
-        "open ./utf16.ini --raw | decode utf-16 | from ini | rename info | get info | get IconIndex"
-    );
-
-    assert_eq!(actual.out, "-236")
-}
-
 #[cfg(feature = "dataframe")]
 #[test]
 fn parses_arrow_ipc() {