exp: add exp remove command (#5443)

* exp: add remove function for removing specific experiment(s)

* add `dvc exp remove` command

* update tests

tests/unit/command/test_experiments.py

@@ -9,6 +9,7 @@ from dvc.command.experiments import (
     CmdExperimentsList,
     CmdExperimentsPull,
     CmdExperimentsPush,
+    CmdExperimentsRemove,
     CmdExperimentsRun,
     CmdExperimentsShow,
 )
@@ -240,3 +241,17 @@ def test_experiments_pull(dvc, scm, mocker):
         jobs=1,
         run_cache=True,
     )
+
+
+def test_experiments_remove(dvc, scm, mocker):
+    cli_args = parse_args(["experiments", "remove", "--queue"])
+    assert cli_args.func == CmdExperimentsRemove
+
+    cmd = cli_args.func(cli_args)
+    m = mocker.patch("dvc.repo.experiments.remove.remove", return_value={})
+
+    assert cmd.run() == 0
+
+    m.assert_called_once_with(
+        cmd.repo, exp_names=[], queue=True,
+    )