Docs and tests for llm aliases list, refs #151

docs/aliases.md

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+(aliases)=
+# Model aliases
+
+LLM supports model aliases, which allow you to refer to a model by a short name instead of its full ID.
+
+To list current aliases, run this:
+
+```bash
+llm aliases
+```
+Example output:
+
+<!-- [[[cog
+from click.testing import CliRunner
+import sys
+sys._called_from_test = True
+from llm.cli import cli
+result = CliRunner().invoke(cli, ["aliases", "list"])
+cog.out("```\n{}```".format(result.output))
+]]] -->
+```
+3.5         : gpt-3.5-turbo
+chatgpt     : gpt-3.5-turbo
+chatgpt-16k : gpt-3.5-turbo-16k
+3.5-16k     : gpt-3.5-turbo-16k
+4           : gpt-4
+gpt4        : gpt-4
+4-32k       : gpt-4-32k
+orca        : orca-openai-compat
+0613        : gpt-3.5-turbo-0613
+```
+<!-- [[[end]]] -->

tests/test_aliases.py

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+from click.testing import CliRunner
+from llm.cli import cli
+
+
+def test_aliases_list():
+    runner = CliRunner()
+    result = runner.invoke(cli, ["aliases", "list"])
+    assert result.exit_code == 0
+    assert result.output == (
+        "3.5 = gpt-3.5-turbo\n"
+        "chatgpt = gpt-3.5-turbo\n"
+        "chatgpt-16k = gpt-3.5-turbo-16k\n"
+        "3.5-16k = gpt-3.5-turbo-16k\n"
+        "4 = gpt-4\n"
+        "gpt4 = gpt-4\n"
+        "4-32k = gpt-4-32k\n"
+    )