RUMS-4053: Escape user input for mapping file packages aliases

[0xnm]

What does this PR do?

Small improvement for the mappingFilePackageAliases configuration usage: since keys are used in the regex, . can be interpreted as any symbol and users may also include .* as a wildcard.

This PR threatens the former as a literal instead of being meta sequence and ignores the latter (since keys are supposed to be the prefixes).

This should speed up algorithm a bit on the large files.

Review checklist (to be filled by reviewers)

• Feature or bugfix MUST have appropriate tests (unit, integration, e2e)
• Make sure you discussed the feature or bugfix with the maintaining team in an Issue
• Make sure each commit and the PR mention the Issue number (cf the CONTRIBUTING doc)

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.15%. Comparing base (ad67028) to head (79a175d).
Report is 5 commits behind head on develop.

Additional details and impacted files

@@              Coverage Diff              @@
##             develop     #325      +/-   ##
=============================================
+ Coverage      77.79%   78.15%   +0.37%     
- Complexity       258      260       +2     
=============================================
  Files             31       31              
  Lines            941      943       +2     
  Branches         113      113              
=============================================
+ Hits             732      737       +5     
+ Misses           152      151       -1     
+ Partials          57       55       -2     

Files with missing lines	Coverage Δ
...com/datadog/gradle/plugin/MappingFileUploadTask.kt	84.72% <100.00%> (+0.44%)	⬆️

... and 1 file with indirect coverage changes

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