Reduced LOC by replacing several instances of Value::Int {}, Value::Float{}, Value::Bool {}, and Value::String {} with Value::int(), Value::float(), Value::boolean() and Value::string() (#7412)

# Description

While perusing Value.rs, I noticed the `Value::int()`, `Value::float()`,
`Value::boolean()` and `Value::string()` constructors, which seem
designed to make it easier to construct various Values, but which aren't
used often at all in the codebase. So, using a few find-replaces
regexes, I increased their usage. This reduces overall LOC because
structures like this:
```
Value::Int {
  val: a,
  span: head
}
```
are changed into
```
Value::int(a, head)
```
and are respected as such by the project's formatter.
There are little readability concerns because the second argument to all
of these is `span`, and it's almost always extremely obvious which is
the span at every callsite.

# User-Facing Changes

None.

# 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/src/formats/from/ssv.rs

@@ -44,13 +44,13 @@ impl Command for FromSsv {
             example: r#"'FOO   BAR
 1   2' | from ssv"#,
             description: "Converts ssv formatted string to table",
-            result: Some(Value::List { vals: vec![Value::Record { cols: vec!["FOO".to_string(), "BAR".to_string()], vals: vec![Value::String { val: "1".to_string(), span: Span::test_data() }, Value::String { val: "2".to_string(), span: Span::test_data() }], span: Span::test_data() }], span: Span::test_data() }),
+            result: Some(Value::List { vals: vec![Value::Record { cols: vec!["FOO".to_string(), "BAR".to_string()], vals: vec![Value::string("1", Span::test_data()), Value::string("2", Span::test_data())], span: Span::test_data() }], span: Span::test_data() }),
         }, Example {
             example: r#"'FOO   BAR
 1   2' | from ssv -n"#,
             description: "Converts ssv formatted string to table but not treating the first row as column names",
             result: Some(
-                Value::List { vals: vec![Value::Record { cols: vec!["column1".to_string(), "column2".to_string()], vals: vec![Value::String { val: "FOO".to_string(), span: Span::test_data() }, Value::String { val: "BAR".to_string(), span: Span::test_data() }], span: Span::test_data() }, Value::Record { cols: vec!["column1".to_string(), "column2".to_string()], vals: vec![Value::String { val: "1".to_string(), span: Span::test_data() }, Value::String { val: "2".to_string(), span: Span::test_data() }], span: Span::test_data() }], span: Span::test_data() }),
+                Value::List { vals: vec![Value::Record { cols: vec!["column1".to_string(), "column2".to_string()], vals: vec![Value::string("FOO", Span::test_data()), Value::string("BAR", Span::test_data())], span: Span::test_data() }, Value::Record { cols: vec!["column1".to_string(), "column2".to_string()], vals: vec![Value::string("1", Span::test_data()), Value::string("2", Span::test_data())], span: Span::test_data() }], span: Span::test_data() }),
         }]
     }