feat: add support for multiple blame ranges like gix blame -L <range> -L <other-range> ...

Update the blame subcommand to handle multiple line ranges. This allows specifying multiple `-L` options similar to the usage of git.

Author: holodorum

src/plumbing/main.rs

@@ -1560,7 +1560,7 @@ pub fn main() -> Result<()> {
         Subcommands::Blame {
             statistics,
             file,
-            range,
+            ranges,
             since,
         } => prepare_and_run(
             "blame",
@@ -1578,7 +1578,7 @@ pub fn main() -> Result<()> {
                     &file,
                     gix::blame::Options {
                         diff_algorithm,
-                        range: range.map(BlameRanges::from_range).unwrap_or_default(),
+                        range: gix::blame::BlameRanges::from_ranges(ranges),
                         since,
                     },
                     out,

src/plumbing/options/mod.rs

@@ -168,8 +168,8 @@ pub enum Subcommands {
         /// The file to create the blame information for.
         file: std::ffi::OsString,
         /// Only blame lines in the given 1-based inclusive range '<start>,<end>', e.g. '20,40'.
-        #[clap(short='L', value_parser=AsRange)]
-        range: Option<std::ops::Range<u32>>,
+        #[clap(short='L', value_parser=AsRange, action=clap::ArgAction::Append)]
+        ranges: Vec<std::ops::Range<u32>>,
         /// Don't consider commits before the given date.
         #[clap(long,  value_parser=AsTime, value_name = "DATE")]
         since: Option<gix::date::Time>,