[MRG] add lancedb as memory

[leeeizhang]

related to: #259

$ cd /path/to/mle/project
$ python3
>>> from mle.utils import LanceDBMemory
>>> memory = LanceDBMemory("./")
>>> memory.add("hello world", metadata={"path": "/path/to/file"})
['deff1675-41ac-4190-b3b6-7ca9fde85c59']
>>> memory.query("hi")
[["vector": [...], 'text': 'hello world', 'id': 'deff1675-41ac-4190-b3b6-7ca9fde85c59', 'metadata': {'path': '/path/to/file'}, '_distance': 0.25669366121292114}]]
>>> memory.delete("deff1675-41ac-4190-b3b6-7ca9fde85c59")
>>> memory.count()
0
>>> memory.drop()

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