allow strings with thousands separators to be converted to filesize or ints (#11724)

# Description

This PR changes `into int` and `into filesize` so that they allow
thousands separators.

### Before
```nushell
❯ '1,000' | into filesize
Error: nu:🐚:cant_convert

  × Can't convert to int.
   ╭─[entry #1:1:1]
 1 │ '1,000' | into filesize
   · ───┬───
   ·    ╰── can't convert string to int
   ╰────

❯ '1,000' | into int
Error: nu:🐚:cant_convert

  × Can't convert to int.
   ╭─[entry #2:1:1]
 1 │ '1,000' | into int
   ·           ────┬───
   ·               ╰── can't convert string to int
   ╰────
  help: string "1,000" does not represent a valid integer
```
### After
```nushell
❯ '1,000' | into filesize
1.0 KB
❯ '1,000' | into int
1000
```

This works by getting the system locale and from that, determining what
the thousands separator is. So, hopefully, this will work across
locales.
# User-Facing Changes
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crates/nu-command/src/conversions/into/filesize.rs

@@ -5,6 +5,7 @@ use nu_protocol::{
     engine::{Command, EngineState, Stack},
     record, Category, Example, PipelineData, ShellError, Signature, Span, SyntaxShape, Type, Value,
 };
+use nu_utils::get_system_locale;
 
 #[derive(Clone)]
 pub struct SubCommand;
@@ -137,7 +138,13 @@ pub fn action(input: &Value, _args: &CellPathOnlyArgs, span: Span) -> Value {
     }
 }
 fn int_from_string(a_string: &str, span: Span) -> Result<i64, ShellError> {
-    match a_string.trim().parse::<bytesize::ByteSize>() {
+    // Get the Locale so we know what the thousands separator is
+    let locale = get_system_locale();
+
+    // Now that we know the locale, get the thousands separator and remove it
+    // so strings like 1,123,456 can be parsed as 1123456
+    let no_comma_string = a_string.replace(locale.separator(), "");
+    match no_comma_string.trim().parse::<bytesize::ByteSize>() {
         Ok(n) => Ok(n.0 as i64),
         Err(_) => Err(ShellError::CantConvert {
             to_type: "int".into(),

crates/nu-command/src/conversions/into/int.rs

@@ -6,6 +6,7 @@ use nu_protocol::{
     engine::{Command, EngineState, Stack},
     Category, Example, PipelineData, ShellError, Signature, Span, SyntaxShape, Type, Value,
 };
+use nu_utils::get_system_locale;
 
 struct Arguments {
     radix: u32,
@@ -400,7 +401,14 @@ fn convert_int(input: &Value, head: Span, radix: u32) -> Value {
 }
 
 fn int_from_string(a_string: &str, span: Span) -> Result<i64, ShellError> {
-    let trimmed = a_string.trim();
+    // Get the Locale so we know what the thousands separator is
+    let locale = get_system_locale();
+
+    // Now that we know the locale, get the thousands separator and remove it
+    // so strings like 1,123,456 can be parsed as 1123456
+    let no_comma_string = a_string.replace(locale.separator(), "");
+
+    let trimmed = no_comma_string.trim();
     match trimmed {
         b if b.starts_with("0b") => {
             let num = match i64::from_str_radix(b.trim_start_matches("0b"), 2) {