[#3886 2/4] Region replacement omdb commands (#5820)

This commit adds some commands to omdb related to the new region
replacement logic:

    $ ./target/debug/omdb db region-replacement
Query for information about region replacements, optionally manually
triggering one

    Usage: omdb db region-replacement [OPTIONS] <COMMAND>

    Commands:
      list     List region replacement requests
      status   Show current region replacements and their status
      info     Show detailed information for a region replacement
      request  Manually request a region replacement
      help     Print this message or the help of the given subcommand(s)

`list` will list all region replacement requests, along with their
request time and state.

`status` will show a summary of all non-Complete region replacements,
along with their state and progress.

`info` will show a detailed view of a region replacement, starting with
the details that the `status` summary shows, then showing all related
notifications and steps taken to drive the replacement forward.

Finally, `request` will request that a region be replaced, and return
the ID of the replacement.

dev-tools/omdb/Cargo.toml

@@ -55,6 +55,7 @@ uuid.workspace = true
 ipnetwork.workspace = true
 omicron-workspace-hack.workspace = true
 multimap.workspace = true
+indicatif.workspace = true
 
 [dev-dependencies]
 expectorate.workspace = true