[C++][Parquet] Add DELTA_LENGTH_BYTE_ARRAY encoder to Parquet writer

[asfimport]

We need to add DELTA_LENGTH_BYTE_ARRAY encoder to implement DELTA_BYTE_ARRAY encoder (ARROW-17619).
ARROW-13388 already implemented DELTA_LENGTH_BYTE_ARRAY decoder.

Reporter: Rok Mihevc / @rok
Assignee: Rok Mihevc / @rok
Watchers: Rok Mihevc / @rok

Related issues:

• [C++][Parquet] Add DELTA_BYTE_ARRAY encoder to Parquet writer (blocks)

PRs and other links:

• GitHub Pull Request #14293

_{Note: This issue was originally created as ARROW-17799. Please see the migration documentation for further details.}