refactor: load max page&chunk configuration in ReadOnlyMemchunk and M…

[shizy818]

…emTableFlushTask

1. load MAX_NUMBER_OF_POINTS_IN_PAGE config in ReadOnlyMemChunk. It is used by nextBatch method of iterators.
2. load MAX_NUMBER_OF_POINTS_IN_PAGE, MAX_NUMBER_OF_POINTS_IN_CHUNK & TARGET_CHUNK_SIZE config in MemTableFlushTask and save in BatchEncodeInfo object. They're used by encodeBatch method of iterators.

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This PR has:

• been self-reviewed.
  • concurrent read
  • concurrent write
  • concurrent read and write
• added documentation for new or modified features or behaviors.
• added Javadocs for most classes and all non-trivial methods.
• added or updated version, license, or notice information
• added comments explaining the "why" and the intent of the code wherever would not be obvious
  for an unfamiliar reader.
• added unit tests or modified existing tests to cover new code paths, ensuring the threshold
  for code coverage.
• added integration tests.
• been tested in a test IoTDB cluster.

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Key changed/added classes (or packages if there are too many classes) in this PR