I want to addEnvironment(name, value) via code instead of xml file

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#### I'm submitting a ...
- [ ] bug report
- [x] feature request
- [ ] support request => Please do not submit support request here, see note at the top of this template.

#### What is the current behavior?
I can't found add environment function in allure

#### If the current behavior is a bug, please provide the steps to reproduce and if possible a minimal demo of the problem

#### What is the expected behavior?
I want to addEnvironment(name, value) via code

#### What is the motivation / use case for changing the behavior?
I want to add environment to show my test line info, and I use jenkins to executor our testcase

#### Please tell us about your environment:

- Allure version: 2.5.0
- Test framework: pytest@3.6.3
- Allure adaptor: allure-pytest@2.5.0

#### Other information

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Bắt đầu bằng cách xác định phần xử lý XML môi trường và các API công khai trong adapter allure-pytest; issue không nêu tên tệp hoặc test. Xác định vị trí một mục môi trường dựa trên mã nguồn sẽ thuộc về, và định nghĩa hoàn thành là có thể thêm một cặp name/value thông qua adapter rồi xác minh cặp đó trong Allure report được tạo.

Do mô hình lập chỉ mục viết ra từ nội dung của issue.