initial performance test

[amunger]

fixes #7437

A single perf test that can be run as a launch configuration, or through npm run testPerformance
It specifies the entire filename for Mocha's filename suffix option so that we can only run one test per launch of vscode. That way we can test perf from start to finish and isolate each test.

[codecov-commenter]

Codecov Report

Merging #10025 (0b2bfe3) into main (580dd68) will increase coverage by 0%.
The diff coverage is n/a.

❗ Current head 0b2bfe3 differs from pull request most recent head 53a9fa4. Consider uploading reports for the commit 53a9fa4 to get more accurate results

@@          Coverage Diff           @@
##            main   #10025   +/-   ##
======================================
  Coverage     63%      63%           
======================================
  Files        211      216    +5     
  Lines      10090    10130   +40     
  Branches    1610     1613    +3     
======================================
+ Hits        6442     6479   +37     
  Misses      3131     3131           
- Partials     517      520    +3     

Impacted Files	Coverage Δ
src/platform/common/utils/misc.ts	69% <0%> (-3%)	⬇️
src/platform/api/kernelApi.ts	71% <0%> (-2%)	⬇️
src/platform/common/platform/fileUtils.node.ts	50% <0%> (-2%)	⬇️
src/platform/serviceRegistry.node.ts	97% <0%> (-1%)	⬇️
src/platform/export/types.ts	100% <0%> (ø)
src/platform/common/platform/types.ts	100% <0%> (ø)
src/platform/common/platform/fs-paths.ts	84% <0%> (ø)
src/platform/debugger/jupyter/debugger.node.ts
...platform/debugger/jupyter/debuggingManager.node.ts
...atform/debugger/jupyter/kernelDebugAdapter.node.ts
... and 21 more