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PARQUET-573: Create a public API for reading and writing file metadata

This patch adds API to read and write metadata as well as improves the writer properties class.
I am planning to add some comments to the code next. Meanwhile, any feedback will be helpful.

Author: Deepak Majeti <deepak.majeti@hpe.com>
Author: Uwe L. Korn <uwelk@xhochy.com>

Closes #143 from majetideepak/metadata and squashes the following commits:

2b8a546 [Deepak Majeti] comments and more testing for metadata api
59147c0 [Deepak Majeti] fix memory leak
34e8975 [Deepak Majeti] review comments and format
a977c6a [Deepak Majeti] added comment for file path
d4f0e82 [Deepak Majeti] friendship between reader and writer. implements PARQUET-692
1047507 [Uwe L. Korn] Better dictionary encoding user experience
7f37f85 [Deepak Majeti] review edits
9dab591 [Deepak Majeti] minor rename
a6b0646 [Deepak Majeti] added more dictionary fallback and enabled options to writer properties
3b9bad3 [Deepak Majeti] Metadata Reader writer

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