feat: env variable support for text request body #959
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PR Description
added the env variable support when writing request body as text

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mainbranch before making this PRflutter upgradeand verify)flutter test) and all tests are passing (i tried to run the tests on the latest branch without doing any changes and still getting fails)Added/updated tests?
We encourage you to add relevant test cases.
OS on which you have developed and tested the feature?