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.

tests/plugins/formats/ini.rs

@@ -0,0 +1,55 @@
+use nu_test_support::fs::Stub::FileWithContentToBeTrimmed;
+use nu_test_support::nu_with_plugins;
+use nu_test_support::playground::Playground;
+
+const TEST_CWD: &str = "tests/fixtures/formats";
+
+#[test]
+fn parses_ini() {
+    let actual = nu_with_plugins!(
+        cwd: TEST_CWD,
+        plugin: ("nu_plugin_formats"),
+        "open sample.ini | get SectionOne.integer"
+    );
+
+    assert_eq!(actual.out, "1234")
+}
+
+#[test]
+fn parses_utf16_ini() {
+    let actual = nu_with_plugins!(
+        cwd: TEST_CWD,
+        plugin: ("nu_plugin_formats"),
+        "open ./utf16.ini --raw | decode utf-16 | from ini | rename info | get info | get IconIndex"
+    );
+
+    assert_eq!(actual.out, "-236")
+}
+
+#[test]
+fn read_ini_with_missing_session() {
+    Playground::setup("from ini with missiong session", |dirs, sandbox| {
+        sandbox.with_files(vec![FileWithContentToBeTrimmed(
+            "some_missing.ini",
+            r#"
+            min-width=450
+            max-width=820
+            [normal]
+            sound-file=/usr/share/sounds/freedesktop/stereo/dialog-information.oga
+            [critical]
+            border-color=FAB387ff
+            default-timeout=20
+            sound-file=/usr/share/sounds/freedesktop/stereo/dialog-warning.oga
+            "#,
+        )]);
+
+        let cwd = dirs.test();
+        let actual = nu_with_plugins!(
+            cwd: cwd,
+            plugin: ("nu_plugin_formats"),
+            r#"open some_missing.ini | get "".min-width "#
+        );
+
+        assert_eq!(actual.out, "450");
+    })
+}