Camera: update NDK metadata tag documents

Camera: update NDK metadata tag documents

- Create a separate ndk_metadata_properties.xml to convert java
  API specific documents to NDK specific.
- Replace link to public SDK by NDK counterparts or hyperlink
  to public SDK website.
- Disable markdown->html rendering on tables because doxygen
  supports markdown syntax and does not support thead/tbody tag.
- Add descriptions to rectangle keys to specify their data
  representation is (left, top, width, height)

Bug: 27102995
Change-Id: I6b6da019dde66f28fce72937f05bd984638ec2ba