AllowCreate not being properly filled in SAMLRequest

[SDepn]

I noticed that since version 2.8.11, the AllowCreate attribute in the NameIDPolicy node in the SAMLRequest was not filled. When allowCreate on the ServiceProvider initialization is either not set (default value) or manually set to false, the field is empty. When it is set to true it throws an string.replace is not a function error.

Digging deeper, I found out that 14055ff introduced a new bug where escapeTag (https://github.com/tngan/samlify/blob/master/src/libsaml.ts#L242) always expects a string for the text variable, while AllowCreate is a boolean.

This results in text || '' (https://github.com/tngan/samlify/blob/master/src/libsaml.ts#L245) either resolving to '' for false, or to true for true.

Setting the allowCreate variable to "true" or "false" in the ServiceProvider initialization and ignoring the type definitions results in the attribute being properly filled.

The easiest fix for this would probably be to just call toString() on the t in https://github.com/tngan/samlify/blob/master/src/libsaml.ts#L270, but I am not sure if this causes other issues.

[SDepn]

Just found out that it's a duplice of #538. Closing this one.