[BUG] Memory Leak

[kimdiego2098]

Version
5.0.1.7

Describe the bug

When using Query.LT or other code for BsonExpressionScalarDelegate , looking up the source code may reveal that there is a dictionary storing expressions, but this dictionary cache is the root cause of memory leakage. I think it should be changed to memorycache (i.e. adding timeout clearing). As can be seen from the graph, the number of dictionary elements has reached over 4000

I had to change the Queries to use Lambda expressions.But this is inconvenient, and there may still be different keys in the dictionary, leading to memory leaks

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Expected behavior
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[kimdiego2098]

@mbdavid Sorry to bother you, but this is a serious memory leak issue