Merge branch 'ps/reftable-reusable-iterator'

Code clean-up to make the reftable iterator closer to be reusable.

* ps/reftable-reusable-iterator:
  reftable/merged: adapt interface to allow reuse of iterators
  reftable/stack: provide convenience functions to create iterators
  reftable/reader: adapt interface to allow reuse of iterators
  reftable/generic: adapt interface to allow reuse of iterators
  reftable/generic: move seeking of records into the iterator
  reftable/merged: simplify indices for subiterators
  reftable/merged: split up initialization and seeking of records
  reftable/reader: set up the reader when initializing table iterator
  reftable/reader: inline `reader_seek_internal()`
  reftable/reader: separate concerns of table iter and reftable reader
  reftable/reader: unify indexed and linear seeking
  reftable/reader: avoid copying index iterator
  reftable/block: use `size_t` to track restart point index

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