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[R-package] enable saving Booster with saveRDS() and loading it with readRDS() (fixes #4296) (#4685)

* idiomatic serialization

* linter

* linter, namespace

* comments, linter, fix failing test

* standardize error messages for null handles

* auto-restore handle in more functions

* linter

* missing declaration

* correct wrong signature

* fix docs

* Update R-package/R/lgb.train.R
Co-authored-by: James Lamb <jaylamb20@gmail.com>

* Update R-package/R/lgb.drop_serialized.R
Co-authored-by: James Lamb <jaylamb20@gmail.com>

* Update R-package/R/lgb.restore_handle.R
Co-authored-by: James Lamb <jaylamb20@gmail.com>

* Update R-package/R/lgb.restore_handle.R
Co-authored-by: James Lamb <jaylamb20@gmail.com>

* Update R-package/R/lgb.make_serializable.R
Co-authored-by: James Lamb <jaylamb20@gmail.com>

* move 'restore_handle' from feature importance to dump method

* missing header

* move arguments order, update docs

* linter

* avoid leaving files in working directory

* add test for save_model=NULL

* missing comma

* Update R-package/R/lgb.restore_handle.R
Co-authored-by: Nikita Titov <nekit94-08@mail.ru>

* Update R-package/src/lightgbm_R.cpp
Co-authored-by: Nikita Titov <nekit94-08@mail.ru>

* change name of error function

* update comment

* restore old serialization functions but set as deprecated

* Update R-package/R/readRDS.lgb.Booster.R
Co-authored-by: Nikita Titov <nekit94-08@mail.ru>

* Update R-package/R/saveRDS.lgb.Booster.R
Co-authored-by: Nikita Titov <nekit94-08@mail.ru>

* update docs

* Update R-package/R/readRDS.lgb.Booster.R
Co-authored-by: James Lamb <jaylamb20@gmail.com>

* Update R-package/R/saveRDS.lgb.Booster.R
Co-authored-by: James Lamb <jaylamb20@gmail.com>

* Update R-package/tests/testthat/test_basic.R
Co-authored-by: James Lamb <jaylamb20@gmail.com>

* Update R-package/R/readRDS.lgb.Booster.R
Co-authored-by: James Lamb <jaylamb20@gmail.com>

* comments

* fix variable name

* restore serialization test for linear models

* Update R-package/R/lightgbm.R
Co-authored-by: James Lamb <jaylamb20@gmail.com>

* update docs

* fix issues with null terminator
Co-authored-by: James Lamb <jaylamb20@gmail.com>
Co-authored-by: Nikita Titov <nekit94-08@mail.ru>