fix: add saml application

[stebenz]

SAML applications can be managed with ZITADEL's terraform provider

Definition of Ready

• Short description of the feature/issue is added in the pr description
• PR is linked to the corresponding user story
• Acceptance criteria are met
• All open todos and follow ups are defined in a new ticket and justified
• Deviations from the acceptance criteria and design are agreed with the PO and documented.
• No debug or dead code
• My code has no repetitions
• All non-functional requirements are met
• The generic lifecycle acceptance test passes for affected resources.
• Examples are up-to-date and meaningful. The provider version is incremented.
• Docs are generated.
• Code is generated where possible.

[codecov]

Codecov Report

Attention: 69 lines in your changes are missing coverage. Please review.

Comparison is base (a1c0eaa) 63.20% compared to head (720e986) 63.32%.
Report is 1 commits behind head on main.

❗ Current head 720e986 differs from pull request most recent head 49fb09f. Consider uploading reports for the commit 49fb09f to get more accurate results

Files	Patch %	Lines
zitadel/application_saml/funcs.go	53.90%	46 Missing and 19 partials ⚠️
zitadel/application_api/funcs.go	0.00%	1 Missing and 1 partial ⚠️
zitadel/application_oidc/funcs.go	0.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #154      +/-   ##
==========================================
+ Coverage   63.20%   63.32%   +0.12%     
==========================================
  Files         156      159       +3     
  Lines       12609    12840     +231     
==========================================
+ Hits         7969     8131     +162     
- Misses       3379     3427      +48     
- Partials     1261     1282      +21     

Flag	Coverage Δ
acceptance-tests	63.32% <70.63%> (+0.12%)	⬆️

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[livio-a]

we should allow more options (in the future) for the metadata (url / file / ...)

but looks ok from what i understand