feat: introduce generalized internal/classfile with spx provider

[aofei]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 67.82522% with 324 lines in your changes missing coverage. Please review.
✅ Project coverage is 67.28%. Comparing base (abc6fbe) to head (4d8116d).

Files with missing lines	Patch %	Lines
internal/classfile/spx/references.go	53.97%	104 Missing and 29 partials ⚠️
internal/classfile/spx/provider.go	58.64%	42 Missing and 13 partials ⚠️
internal/classfile/spx/resource.go	74.38%	38 Missing and 14 partials ⚠️
internal/classfile/spx/types.go	63.79%	20 Missing and 1 partial ⚠️
internal/server/compile.go	83.67%	8 Missing and 8 partials ⚠️
internal/server/spx_resource.go	78.57%	10 Missing and 2 partials ⚠️
internal/server/server.go	52.38%	9 Missing and 1 partial ⚠️
internal/classfile/project.go	87.50%	4 Missing and 4 partials ⚠️
internal/classfile/provider.go	74.19%	7 Missing and 1 partial ⚠️
internal/server/completion.go	53.33%	7 Missing ⚠️
... and 1 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #225      +/-   ##
==========================================
- Coverage   68.29%   67.28%   -1.02%     
==========================================
  Files          55       63       +8     
  Lines        6955     7442     +487     
==========================================
+ Hits         4750     5007     +257     
- Misses       1821     2015     +194     
- Partials      384      420      +36     

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