feat: ggplot survival curves

[ESCRI11]

Added the option to plot using ggplot (survminer::ggsurvplot) to obtain easier to read plots. Especially good for stratified survival analysis.

E.g.:

[neelsoumya]

Thanks @ESCRI11 can you please sync with the main branch and then resend this pull request. I am getting merge conflicts. It says your branch is 255 commits behind.

[ESCRI11]

Synced with main branch. Now it should be ok

[neelsoumya]

Thanks @ESCRI11 !
great work!
Could you please update the DESCRIPTION file also with an updated version number? e.g. 2.1.3

[ESCRI11]

Done

[neelsoumya]

thanks @ESCRI11 !

[StuartWheater]

Results of devtools::check()

❯ checking for portable file names ... WARNING
Found the following file with a non-portable file name:
dssurvival lay summary.pdf
These are not fully portable file names.
See section ‘Package structure’ in the ‘Writing R Extensions’ manual.
Found the following non-portable file paths:
dsSurvivalClient/tests/testthat/data_files/SURVIVAL/COLLAPSE_NO_MISSING/collapse_no_missing_study1.csv
dsSurvivalClient/tests/testthat/data_files/SURVIVAL/COLLAPSE_NO_MISSING/collapse_no_missing_study2.csv
dsSurvivalClient/tests/testthat/data_files/SURVIVAL/COLLAPSE_NO_MISSING/collapse_no_missing_study3.csv

Tarballs are only required to store paths of up to 100 bytes and cannot
store those of more than 256 bytes, with restrictions including to 100
bytes for the final component.
See section ‘Package structure’ in the ‘Writing R Extensions’ manual.

❯ checking package subdirectories ... WARNING
Invalid citation information in ‘inst/CITATION’:
Error in bibentry(bibtype = entry, textVersion = textVersion, header = header, footer = footer, ...): argument is missing, with no default

❯ checking Rd \usage sections ... WARNING
Undocumented arguments in documentation object 'ds.plotsurvfit'
‘ggplot’

Functions with \usage entries need to have the appropriate \alias
entries, and all their arguments documented.
The \usage entries must correspond to syntactically valid R code.
See chapter ‘Writing R documentation files’ in the ‘Writing R
Extensions’ manual.

❯ checking files in ‘vignettes’ ... WARNING
Files in the 'vignettes' directory but no files in 'inst/doc':
‘readme.md’
Package has no Sweave vignette sources and no VignetteBuilder field.

❯ checking for hidden files and directories ... NOTE
Found the following hidden files and directories:
.github
These were most likely included in error. See section ‘Package
structure’ in the ‘Writing R Extensions’ manual.

❯ checking top-level files ... NOTE
Non-standard files/directories found at top level:
‘LICENSE.md’ ‘dssurvival lay summary.pdf’

❯ checking dependencies in R code ... NOTE
Namespaces in Imports field not imported from:
‘data.table’ ‘fields’ ‘gridExtra’ ‘survival’
All declared Imports should be used.

[neelsoumya]

thanks @ESCRI11 @StuartWheater