add 6 more table themes (#10279)

# Description

After looking at a users terminal that didn't support UTF-8, I wanted to
add some themes that may help them. Here's what they look like.

## psql

![image](https://github.com/nushell/nushell/assets/343840/67ac003a-72f1-4e2b-8bb0-244b70385d59)

## markdown

![image](https://github.com/nushell/nushell/assets/343840/a8f4a439-013b-48ee-b9e0-284ec47d1eef)

## dots
please excuse the different theme

![image](https://github.com/nushell/nushell/assets/343840/fb931650-cc64-4f0a-bf3d-ec736e0374ad)

## restructured

![image](https://github.com/nushell/nushell/assets/343840/80595a8e-f2b3-49dc-ad02-81e94bde5253)

## ascii_rounded

![image](https://github.com/nushell/nushell/assets/343840/42f0b8b2-1fd2-4ae5-b28c-477e83ded354)

## basic_compact

![image](https://github.com/nushell/nushell/assets/343840/5888b6b2-b9b8-48bc-963e-5a76ef246adc)


# User-Facing Changes
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# Tests + Formatting
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crates/nu-command/src/viewers/table.rs

@@ -330,6 +330,12 @@ fn supported_table_modes() -> Vec<Value> {
         Value::test_string("rounded"),
         Value::test_string("thin"),
         Value::test_string("with_love"),
+        Value::test_string("psql"),
+        Value::test_string("markdown"),
+        Value::test_string("dots"),
+        Value::test_string("restructured"),
+        Value::test_string("ascii_rounded"),
+        Value::test_string("basic_compact"),
     ]
 }
 

crates/nu-table/src/common.rs

@@ -157,6 +157,12 @@ pub fn load_theme_from_config(config: &Config) -> TableTheme {
         "reinforced" => TableTheme::reinforced(),
         "heavy" => TableTheme::heavy(),
         "none" => TableTheme::none(),
+        "psql" => TableTheme::psql(),
+        "markdown" => TableTheme::markdown(),
+        "dots" => TableTheme::dots(),
+        "restructured" => TableTheme::resturctured(),
+        "ascii_rounded" => TableTheme::ascii_rounded(),
+        "basic_compact" => TableTheme::basic_compact(),
         _ => TableTheme::rounded(),
     }
 }

crates/nu-table/src/table_theme.rs

@@ -38,6 +38,56 @@ impl TableTheme {
         }
     }
 
+    pub fn psql() -> TableTheme {
+        Self {
+            theme: Style::psql().into(),
+            full_theme: Style::psql().into(),
+            has_inner: true,
+        }
+    }
+
+    pub fn markdown() -> TableTheme {
+        Self {
+            theme: Style::markdown().into(),
+            full_theme: Style::markdown().into(),
+            has_inner: true,
+        }
+    }
+
+    pub fn dots() -> TableTheme {
+        let theme = Style::dots().remove_horizontal().into();
+        Self {
+            theme,
+            full_theme: Style::dots().into(),
+            has_inner: true,
+        }
+    }
+
+    pub fn resturctured() -> TableTheme {
+        Self {
+            theme: Style::re_structured_text().into(),
+            full_theme: Style::re_structured_text().into(),
+            has_inner: true,
+        }
+    }
+
+    pub fn ascii_rounded() -> TableTheme {
+        Self {
+            theme: Style::ascii_rounded().into(),
+            full_theme: Style::ascii_rounded().into(),
+            has_inner: true,
+        }
+    }
+
+    pub fn basic_compact() -> TableTheme {
+        let theme = Style::ascii().remove_horizontal().into();
+        Self {
+            theme,
+            full_theme: Style::ascii().into(),
+            has_inner: true,
+        }
+    }
+
     pub fn compact() -> TableTheme {
         let theme = Style::modern()
             .remove_left()