feat(client): move overlay option into client

[hiroppy]

• This is a bugfix
• This is a feature
• This is a code refactor
• This is a test update
• This is a docs update
• This is a metadata update

For Bugs and Features; did you add new tests?

Motivation / Use-Case

Move overlay option into client.

Breaking Changes

Yes

Additional Info

[codecov]

Codecov Report

Merging #2888 (4013f77) into master (143ce32) will increase coverage by 0.16%.
The diff coverage is 83.33%.

@@            Coverage Diff             @@
##           master    #2888      +/-   ##
==========================================
+ Coverage   92.45%   92.61%   +0.16%     
==========================================
  Files          38       38              
  Lines        1246     1246              
  Branches      324      324              
==========================================
+ Hits         1152     1154       +2     
+ Misses         89       87       -2     
  Partials        5        5              

Impacted Files	Coverage Δ
lib/Server.js	95.46% <50.00%> (ø)
client-src/clients/SockJSClient.js	65.90% <100.00%> (+4.54%)	⬆️
client-src/clients/WebsocketClient.js	58.13% <100.00%> (ø)
lib/servers/SockJSServer.js	94.11% <100.00%> (ø)
lib/servers/WebsocketServer.js	94.11% <100.00%> (ø)

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[alexander-akait]

I will put in my TODO - more e2e tests

[alexander-akait]

Thanks