Fixed IDP keystore management

[veselov]

Fixes #65

• IdpConfiguration needs to provide keyStore password to shared configuration, or else wrong password will be used if configured
• Adding new entities didn't create keystores for them
• Changed default password to trip test failure
• Provide JKS key manager with bottomless password map

Now, that last bit got me the most cringing. Whoever wrote SAML JKSKeyManager should be fully ashamed of themselves for not making it flexible enough to source passwords from some other place but just a map of passwords. The only other way to fix this (given the implementation), is to recreate the JKS key manager every time there is a new entity, but then we'll need to keep the password map locally. Let me know if you'd like me to change that bit.

[codecov]

Codecov Report

❌ Patch coverage is 41.66667% with 14 lines in your changes missing coverage. Please review.
✅ Project coverage is 89.16%. Comparing base (cf473a0) to head (820af6a).
⚠️ Report is 65 commits behind head on main.

Files with missing lines	Patch %	Lines
...rc/main/java/mujina/idp/WebSecurityConfigurer.java	30.00%	14 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main      #66      +/-   ##
============================================
- Coverage     91.28%   89.16%   -2.13%     
- Complexity      155      156       +1     
============================================
  Files            29       29              
  Lines           551      572      +21     
  Branches         11       11              
============================================
+ Hits            503      510       +7     
- Misses           37       51      +14     
  Partials         11       11              

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