modify memory requirement calculation.

* docs: add R example source code

* test: check if RJDBC was installed

* test: add R test scripts

* test: chmod of test_R.sh

* test: fix test_go.sh; add R sample to document

* test: add test scripts to cases.task

* test: fix errors caused by  tset_python.sh and test_java.sh

* test: fix  test_python.sh

* test: modify java test case and improve opentsdb-json.mdx

* test: fix test_R.sh

* docs:docs-cn-example csharp fix example code && fix reference ident

* use 'dotnet format' to correct coding style
Co-authored-by: Shuduo Sang <sangshuduo@gmail.com>

* docs: remove install python connector from local path

* docs: use jdbc dist jar for R

* docs: fix bug fo cuased by  by >

* docs: fix compile erro

* docs:doc-cn Node.js add RESTful docs

* docs:doc-cn add Node.js RESTful docs

* docs:docs-cn fix C# invalid hyperlink

* docs:docs-cn node add restful docs fix format

* docs:docs-cn node add restful docs fix with comment

* [TD-14175]<docs>: connector

* docs: correct few secions and fix few typos

* docs: update description of installed directory.