feat: add client.hotEntry and --client-hot-entry

[snitin315]

• 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?

Yes

Motivation / Use-Case

Fix #3228

I want to split #3228 (comment) into multiple commit/PRs

• This PR - rename needHotEntry -> hotEntry: boolean (--client-hot-entry), default value const hotEntry = options.client.hotEntry || options.hot

• Next PR - remove needClientEntry in favor client: boolean | ClientOptions | function(entryName): ClientOptions, so you can disable hotEntry or whole client by entries using function (--client and --no-client)

Breaking Changes

BREAKING CHANGE: client.needHotEntry was removed in favor of client.hotEntry

Additional Info

No

[codecov]

Codecov Report

Merging #3294 (094f7ed) into master (5f657a2) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #3294   +/-   ##
=======================================
  Coverage   95.54%   95.55%           
=======================================
  Files          34       34           
  Lines        1258     1260    +2     
  Branches      356      357    +1     
=======================================
+ Hits         1202     1204    +2     
  Misses         52       52           
  Partials        4        4           

Impacted Files	Coverage Δ
lib/utils/DevServerPlugin.js	98.82% <100.00%> (ø)
lib/utils/normalizeOptions.js	100.00% <100.00%> (ø)

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[alexander-akait]

@snitin315 Can you rebase?

[snitin315]

@alexander-akait Done ✅

[alexander-akait]

@snitin315 Let's do the next PR ⭐