Direct mode stats

[badumbatish]

Add statistics for direct mode.

This allows downstream users to inspect how efficient the direct mode caching is. My downstream work would also benefit from some form of direct mode statistics for our testing

See the new form of show-stats

Compile requests                      3
Compile requests executed             0
Cache hits                            0
Direct cache hits                     0
Cache misses                          0
Direct cache hits                     0
Cache hits rate                       -
Direct cache hits rate                -
Cache timeouts                        0
Cache read errors                     0
Forced recaches                       0
Cache write errors                    0
Cache errors                          0
Compilations                          0
Compilation failures                  0
Non-cacheable compilations            0
Non-cacheable calls                   0
Non-compilation calls                 3
Unsupported compiler calls            0
Average cache write               0.000 s
Average compiler                  0.000 s
Average cache read hit            0.000 s
Failed distributed compilations       0
Cache location                  Local disk: "/home/jjasmine/.cache/sccache"
Base directories                (none)
Use direct/preprocessor mode?   yes
Version (client)                0.17.0
Max cache size                       10 GiB

No AI is used for this PR

[codecov-commenter]

Codecov Report

❌ Patch coverage is 93.61702% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 71.83%. Comparing base (46e96ab) to head (45d8ca9).
⚠️ Report is 17 commits behind head on main.

Files with missing lines	Patch %	Lines
src/compiler/compiler.rs	78.57%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2844      +/-   ##
==========================================
- Coverage   72.90%   71.83%   -1.07%     
==========================================
  Files          72       72              
  Lines       37275    38834    +1559     
==========================================
+ Hits        27176    27898     +722     
- Misses      10099    10936     +837     

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[sylvestre]

can we do a if instead of a match ? thanks

[sylvestre]

and please fix

error: all variants have the same prefix: `Direct`
    --> src/compiler/compiler.rs:1207:1
     |
1207 | / pub enum CacheType {
1208 | |     DirectHit,
1209 | |     DirectMiss,
1210 | |     DirectNotAttempted,
1211 | | }
     | |_^
     |