[MRG] clean chromadb and add manage api for lancedb memory

[leeeizhang]

Closes #266

list all data in a memory table (only list the key, not all raw data)

from mle.utils import LanceDBMemory
memory = LanceDBMemory("./")
memory.add("hello world", metadata={"file": "/path/to/file"})

print(memory.list_all_keys())
print(memory.get(record_id='xxx'))

provide a CLI interface to add/remove a file from the memory

from mle.utils import LanceDBMemory
memory = LanceDBMemory("./")

memory.get_by_metadata(key="file", value="/path/to/file")
memory.delete_by_metadata(key="file", value="/path/to/file")

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[huangyz0918]

🎉 Looks good!

[huangyz0918]

Cloud you add a set of new CLI commands, called mle memory which provides memory CRUD?

• mle memory --add <file/or dir>
• mle memory --rm <file_key>: right now the file key is the absolute file path when saving, can the code will be divided into several chunks, --rm should remove all chunks with the same file name.
• mle memory --update <file_key>: just remove all related chunks and add the file again