feat: permit to configure fs vault with configuration file

[ndr-brt]

What this PR changes/adds

Uses getSetting where possible instead of propOrEnv

Why it does that

permit vault to be configured via configuration (!)

Further notes

Linked Issue(s)

Closes #1106

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[codecov-commenter]

Codecov Report

Patch coverage: 20.00% and no project coverage change.

Comparison is base (112ade7) 71.63% compared to head (f86c67d) 71.64%.

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Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3307   +/-   ##
=======================================
  Coverage   71.63%   71.64%           
=======================================
  Files         831      831           
  Lines       16681    16679    -2     
  Branches      953      953           
=======================================
  Hits        11949    11949           
+ Misses       4336     4334    -2     
  Partials      396      396           

Impacted Files	Coverage Δ
...eclipse/edc/vault/filesystem/FsVaultExtension.java	0.00% <0.00%> (ø)
...edc/util/configuration/ConfigurationFunctions.java	66.66% <100.00%> (ø)

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