Added speed improvement to retrieving web Table data rows

[jamesmcroft]

Resolves #194

Changes have been made to introduce a new By locator for retrieving table data rows based on whether a tr element is located which contains td elements.

PR checklist

• Have Legerity sample tests been added or updated, run locally, and all pass
• Have added or updated support for platform specific element wrappers been reflected in the Page Object Generator
• Have code styling rules been run on all new source file changes
• Have relevant articles in the docs been added or updated for all new source file changes
• Have major breaking changes been made and are documented

Other information