support custom table column width

[maybeec]

In asciidoc you might specify custom columns width to have a more suitable layout for the contained data. This can be done, e.g., by [options="header", cols="15%,15%,70%"].

Currently, the table in the resulting pdf will be aligned as intended, but unfortunately the text within the cells will not.

(see current version of oasp4j-security doc. Might be adapted if this feature will not be implemented)