Replace manual try/finally with using declarations in TS parser

[nicolo-ribaudo]

Better viewed with whitespace diff disabled, as there are a lot of indentation changes: https://github.com/nicolo-ribaudo/babel/pull/10/files?w=1

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (3c17c6c) 93.07% compared to head (daf390e) 93.20%.

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Additional details and impacted files

@@                    Coverage Diff                     @@
##           parsing-pipeline-using      #10      +/-   ##
==========================================================
+ Coverage                   93.07%   93.20%   +0.13%     
==========================================================
  Files                         523      523              
  Lines                       95010    94940      -70     
  Branches                    13083    13067      -16     
==========================================================
+ Hits                        88429    88492      +63     
+ Misses                       6406     6300     -106     
+ Partials                      175      148      -27     

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