Added a check for extension functions that are sourced as available commands.
Added a check for extension functions that are sourced as available commands.

sdkman/sdkman-cli,gvmtool/gvm-cli,DealerDotCom/gvm-cli,dsyer/gvm,jbovet/gvm,GsusRecovery/sdkman-cli,skpal/sdkman-cli,DealerDotCom/gvm-cli,skpal/sdkman-cli,nobeans/gvm-cli,nobeans/gvm-cli,GsusRecovery/sdkman-cli,shanman190/sdkman-cli,dsyer/gvm,busches/gvm-cli