Add --limit option to docker search

This fix tries to address the issue raised in #23055.
Currently `docker search` result caps at 25 and there is
no way to allow getting more results (if exist).

This fix adds the flag `--limit` so that it is possible
to return more results from the `docker search`.

Related documentation has been updated.

Additional tests have been added to cover the changes.

This fix fixes #23055.

Signed-off-by: Yong Tang <yong.tang.github@outlook.com>

docs/reference/commandline/search.md

@@ -19,6 +19,7 @@ parent = "smn_cli"
                            - is-official=(true|false)
                            - stars=<number> - image has at least 'number' stars
       --help               Print usage
+      --limit=25           Maximum returned search results
       --no-trunc           Don't truncate output
 
 Search [Docker Hub](https://hub.docker.com) for images
@@ -74,6 +75,12 @@ at least 3 stars and the description isn't truncated in the output:
     progrium/busybox                                                                                               50                   [OK]
     radial/busyboxplus   Full-chain, Internet enabled, busybox made from scratch. Comes in git and cURL flavors.   8                    [OK]
 
+## Limit search results (--limit)
+
+The flag `--limit` is the maximium number of results returned by a search. This value could
+be in the range between 1 and 100. The default value of `--limit` is 25.
+
+
 ## Filtering
 
 The filtering flag (`-f` or `--filter`) format is a `key=value` pair. If there is more