Add new param annotation

[baev]

Context

This pull request extends parameters API. The target issues are

1. Add an ability to exclude some parameters from historyId calculation #80 Opportunity to exclude test parameter from history matching allure2#342 Opportunity to exclude test parameter from history matching. By now, all the parameters are included in history id calculation. The new excluded flag can change the behaviour.

2. Feature request: a way to disable step parameter auto-displaying in the report. allure2#863 Hidden/Masked parameters. Sometimes, parameters may contains sensitive data. The request add's to additional modes to parameters: HIDDEN and MASKED

API changes

• New Boolean excluded field added to io.qameta.allure.model.Parameter
• New io.qameta.allure.model.Parameter.Mode enum added.
• New Parameter.Mode mode field added to io.qameta.allure.model.Parameter
• New io.qameta.allure.Param annotation, that already can be used together with Step:

  @Step("Login")
  void doLogin(@Param("Username") String user, @Param(name="Password", mode=MASKED) String pass) {
      // do something
  }

• Additional Allure#parameter methods to respect new parameter's fields
• Additional StepContext#parameter methods

Checklist

• Sign Allure CLA
• Provide unit tests