Rewrite the front controller to use a ResourceResolver so not all possible routes need to be mapped

[matthijsln]

So extensions aren't restricted to only use /ext/, but can also use routes like /portal/ or /page/.

[github-actions]

Test Results

300 tests  ±0   298 ✅ ±0   3m 37s ⏱️ -5s
 32 suites ±0     2 💤 ±0 
 32 files   ±0     0 ❌ ±0 

Results for commit 25c21d7. ± Comparison against base commit 7cbf798.

♻️ This comment has been updated with latest results.

[codecov]

Codecov Report

Attention: Patch coverage is 45.45455% with 24 lines in your changes missing coverage. Please review.

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
...pi/configuration/base/FrontControllerResolver.java	38%	14 Missing and 6 partials ⚠️
...p/api/configuration/base/IndexHtmlTransformer.java	0%	4 Missing ⚠️

@@          Coverage Diff           @@
##             main   #1097   +/-   ##
======================================
+ Coverage      77%     77%   +1%     
  Complexity     87      87           
======================================
  Files         116     116           
  Lines        5593    5595    +2     
  Branches      482     486    +4     
======================================
+ Hits         4279    4282    +3     
+ Misses       1064    1057    -7     
- Partials      250     256    +6     

Files with missing lines	Coverage Δ	Complexity Δ
...tailormap/api/configuration/base/WebMvcConfig.java	100% <100%> (ø)	0 <0> (ø)
...p/api/configuration/base/IndexHtmlTransformer.java	34% <0%> (-8%)	0 <0> (ø)
...pi/configuration/base/FrontControllerResolver.java	38% <38%> (ø)	0 <0> (?)