feat: Add starship preset command (#4112)

* Add starship preset command

* Use ValueEnum for preset command

* Generate ValueEnum struct in build.rs

* Use absolute paths and refactor codegen

* Use dunce to canonicalize path

* Use raw string literal in include_bytes!

* Use .cloned()

* Apply fixes

* Fix path escaping

* Removed error message if stdout is unavailable

Co-authored-by: David Knaack <davidkna@users.noreply.github.com>

Co-authored-by: David Knaack <davidkna@users.noreply.github.com>

docs/presets/bracketed-segments.md

@@ -9,6 +9,10 @@ in brackets instead of using the default Starship wording ("via", "on", etc.).
 
 ### Configuration
 
+```sh
+starship preset bracketed-segments > ~/.config/starship.toml
+```
+
 [Click to download TOML](/presets/toml/bracketed-segments.toml)
 
 <<< @/.vuepress/public/presets/toml/bracketed-segments.toml

docs/presets/nerd-font.md

@@ -12,6 +12,10 @@ This preset changes the symbols for each module to use Nerd Font symbols.
 
 ### Configuration
 
+```sh
+starship preset nerd-font-symbols > ~/.config/starship.toml
+```
+
 [Click to download TOML](/presets/toml/nerd-font-symbols.toml)
 
 <<< @/.vuepress/public/presets/toml/nerd-font-symbols.toml

docs/presets/no-runtimes.md

@@ -8,6 +8,10 @@ This preset hides the version of language runtimes. If you work in containers or
 
 ### Configuration
 
+```sh
+starship preset no-runtime-versions > ~/.config/starship.toml
+```
+
 [Click to download TOML](/presets/toml/no-runtime-versions.toml)
 
 <<< @/.vuepress/public/presets/toml/no-runtime-versions.toml

docs/presets/pastel-powerline.md

@@ -13,6 +13,10 @@ It also shows how path substitution works in starship.
 
 ### Configuration
 
+```sh
+starship preset pastel-powerline > ~/.config/starship.toml
+```
+
 [Click to download TOML](/presets/toml/pastel-powerline.toml)
 
 <<< @/.vuepress/public/presets/toml/pastel-powerline.toml

docs/presets/plain-text.md

@@ -9,6 +9,10 @@ don't have access to Unicode.
 
 ### Configuration
 
+```sh
+starship preset plain-text-symbols > ~/.config/starship.toml
+```
+
 [Click to download TOML](/presets/toml/plain-text-symbols.toml)
 
 <<< @/.vuepress/public/presets/toml/plain-text-symbols.toml

docs/presets/pure-preset.md

@@ -8,6 +8,10 @@ This preset emulates the look and behavior of [Pure](https://github.com/sindreso
 
 ### Configuration
 
+```sh
+starship preset pure-preset > ~/.config/starship.toml
+```
+
 [Click to download TOML](/presets/toml/pure-preset.toml)
 
 <<< @/.vuepress/public/presets/toml/pure-preset.toml