Add stream_flags option

[sashaaro]

Q	A
Bug fix?	no
New feature?	yes
BC breaks?	no
Deprecations?	no
Related tickets	f
Documentation
License	MIT

What's in this PR?

Add stream_flags option

Why?

for example I want pass STREAM_CLIENT_PERSISTENT

Example Usage

new Client($factory, ['stream_flags' => STREAM_CLIENT_PERSISTENT])

Checklist

• [x] Updated CHANGELOG.md to describe BC breaks / deprecations | new feature | bugfix
• [ ] Documentation pull request created (if not simply a bugfix)

To Do

• [ ] If the PR is not complete but you want to discuss the approach, list what remains to be done here