Add a second parameter to Database.exec to bind parameters to the statements (#364)

* - allow "exec" commmand to pass dictionary-params to webworker
- add test passing dictionary-params to webworker

* - add documentation

* Update README.md

Co-Authored-By: Ophir LOJKINE <ophir.lojkine@auto-grid.com>

* fix exec-command example-code to be consistent with example-result

* - fix english-grammar error "an sql" to "a sql"

* - revert grammar-change in c6aa8884baa921e3aedf31f30796db1ddece5c35

* - resolve conversation - Statement.BindParams
- resolve conversation - replace "several queries" with "several statements"
- try to limit documentation to 80-column width

Co-authored-by: kai.zhu <kai.zhu@windebt.com>
Co-authored-by: Ophir LOJKINE <ophir.lojkine@auto-grid.com>