v2.12.0

Add Global Search and Global Beacon support (#119)

* add support for global beacon endpoint

* update R package version

* add new section to news

* add roxygen generated docs

* add global search support

* refactor parameters

* add R markdown notebook example for Global Beacon and Global Seach functionality

* get search results with pagination

* get subjects from global search

* update .rmd file with examples

* add table of content for example file

* add query (advanced query) as the first search argument

* remove unnecessary arguments and comments

* refactor function names

* refactor rmd file and examples to address function changes

* fail make check on warning

* fix function name typo in docs in Rmd file

* updat autogenerated docs

* update description and news

Co-authored-by: David Caplan <dcaplan@solvebio.com>