fix: replace getQueryString with getParameter to avoid reading request inputstream

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 75.86207% with 7 lines in your changes are missing coverage. Please review.

Project coverage is 67.37%. Comparing base (408a0a0) to head (f4231e3).

Files	Patch %	Lines
.../arex/inst/httpservlet/adapter/ServletAdapter.java	60.00%	2 Missing and 2 partials :warning:
.../java/io/arex/agent/bootstrap/util/StringUtil.java	86.66%	1 Missing and 1 partial :warning:
.../io/arex/inst/httpservlet/ServletAdviceHelper.java	50.00%	0 Missing and 1 partial :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #424 +/- ## ============================================ + Coverage 67.36% 67.37% +0.01% - Complexity 3544 3553 +9 ============================================ Files 409 410 +1 Lines 13585 13610 +25 Branches 1605 1614 +9 ============================================ + Hits 9151 9170 +19 - Misses 3734 3737 +3 - Partials 700 703 +3 ```

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[sonarcloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
84.9% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud