Include AuthnRequestsSigned attribute in all metadata

[Its-Just-Nans]

Description

Add AuthnRequestsSigned="false" if the options is defined

Checklist:

• Link to SAML spec: https://docs.oasis-open.org/security/saml/v2.0/saml-metadata-2.0-os.pdf page 18: optionnal param
• Tests included
• Documentation updated

[codecov]

Codecov Report

Merging #143 (ef21c5f) into master (cf9d3bc) will increase coverage by 0.02%.
The diff coverage is 100.00%.

❗ Current head ef21c5f differs from pull request most recent head b1eadcb. Consider uploading reports for the commit b1eadcb to get more accurate results

@@            Coverage Diff             @@
##           master     #143      +/-   ##
==========================================
+ Coverage   80.61%   80.64%   +0.02%     
==========================================
  Files          11       11              
  Lines         810      811       +1     
  Branches      244      245       +1     
==========================================
+ Hits          653      654       +1     
  Misses         71       71              
  Partials       86       86              

Impacted Files	Coverage Δ
src/types.ts	100.00% <ø> (ø)
src/metadata.ts	90.69% <100.00%> (+0.22%)	⬆️

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