Add end-line and end-column info to `codeql:` links

[jeongsoolee09]

Currently, the codeql: links three info: file path, start line, and start column. However, a location in SARIF is a 5-tuple:

• file path,
• start line,
• start column,
• end line, and
• end column.

Encoding the end line and end column in the link should make it easy to implement #11.