Search in test parameters

#### 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?

Now search field is applied only to test names (not to parameters).


#### What is the expected behavior?

It is useful to search inside test parameters along with test names.
For example, I expect to see `#2 testFour null, null, some-value, null` in the second screenshot above (search `some`).

#### What is the motivation / use case for changing the behavior?

We use browser name as test parameter. And I'd like to filter only one browser, for example.

#### Please tell us about your environment:

Allure version: 2.6.0

No source file or test is named in the issue. Reproduce the report search with a parameter such as `some-value`, then trace the existing test-name search entry point and verify that matching parameter text appears in the filtered results while existing name search still works.

Written by the indexing model from the issue text.