feat(comment): comment on issues and pull requests the gh way

tea issue comment 12 --body "LGTM" failed with "unknown flag: --body"; the
comment had to be created with issue comment create. issue comment and
pr comment now take the issue or pull request and -b/-F/-e directly,
plus --edit-last and --delete-last for your last comment. The
subcommands stay, create is also add, and a misspelled subcommand
suggests the right one.

Comments are written in the configured editor or a multi-line
"Comment (markdown):" field, which edits start from the current text,
without a confirmation afterwards. The new comment's URL goes to stdout
with a ✓ line; deletes ask "Delete comment 81 on alice/x#1?". comment
list shows each comment under a "#79 alice • about 2 hours ago"
heading on a terminal and as key/value blocks when piped, and comment
JSON gains issue_number.

Signed-off-by: bircni <bircni@icloud.com>

internal/app/human_output_test.go

@@ -174,7 +174,7 @@ func TestMultiItemHumanOutputPagesOnce(t *testing.T) {
 	}{
 		{[]string{"branch", "list"}, "Showing 2 of 2 branches in alice/project\n\nNAME            COMMIT  PROTECTED  UPDATED  MESSAGE\nmain (default)  abc\ndev             def\n"},
 		{[]string{"milestone", "issue", "list", "3"}, "1  Issue 1    closed  issue\n2  Issue 2    closed  issue\n"},
-		{[]string{"issue", "comment", "list", "5"}, "1 alice\none\n\n2 bob\ntwo\n\n"},
+		{[]string{"issue", "comment", "list", "5"}, "#1  alice\n  one\n\n#2  bob\n  two\n"},
 	} {
 		t.Run(tc.args[0]+" "+tc.args[1], func(t *testing.T) {
 			deps, out, _, pager := pagedDeps(t, server.URL, nil, "pager", "fake-pager", "color", "never", "hyperlinks", "never")