refact pkg/parser: rename DataCapture -> Stash, extract methods

[mmetc]

No description provided.

[github-actions]

@mmetc: There are no area labels on this PR. You can add as many areas as you see fit.

• /area agent
• /area local-api
• /area cscli
• /area appsec
• /area security
• /area configuration

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[codecov]

Codecov Report

❌ Patch coverage is 42.99065% with 61 lines in your changes missing coverage. Please review.
✅ Project coverage is 61.49%. Comparing base (1539ece) to head (95097c9).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
pkg/parser/stash.go	43.18%	36 Missing and 14 partials ⚠️
pkg/parser/grok.go	25.00%	4 Missing and 2 partials ⚠️
pkg/parser/node.go	54.54%	3 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3923      +/-   ##
==========================================
- Coverage   61.50%   61.49%   -0.01%     
==========================================
  Files         409      410       +1     
  Lines       42062    42085      +23     
==========================================
+ Hits        25869    25879      +10     
- Misses      14067    14076       +9     
- Partials     2126     2130       +4     

Flag	Coverage Δ
bats	45.58% <1.86%> (+<0.01%)	⬆️
unit-linux	34.51% <42.99%> (+0.01%)	⬆️
unit-windows	24.48% <42.99%> (-0.01%)	⬇️

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[sabban]

lgtm