Add support for `server.tomcat.accesslog.request-attributes-enabled`

[snicoll]

See https://stackoverflow.com/questions/40150891/how-to-set-the-property-requestattributesenabled-for-accesslogvalve-in-apache-to

Looks sensible to me even though we should draw a line somewhere. WDYT @wilkinsona ?

[wilkinsona]

Seems sensible enough to me too

[dmengelt]

very nice! thanks @snicoll