Increment version number 0.2.0rc0 -> 0.2.0

PiperOrigin-RevId: 205279145

Increment version to 0.2.0-rc0 in preparation for new release.

PiperOrigin-RevId: 204807373

Bump rc0->rc1. Cannott re-upload pip package with the same RC

PiperOrigin-RevId: 200846594

1. Rearrange linesearch package and build rules to ensure inclusion i…

…n pip pkg

build. 2. Rename hz_line_search to eliminate abbreviation, and omit
'_line_search' since it'll now be scoped to the linesearch sub-package

PiperOrigin-RevId: 200793549