fix(config): define missing default options

[glowcloud]

Refs #9945

Choices for the default values explained in: #9945 (comment)

[char0n]

@glowcloud didn't we forget to assing proper typecasting to these new config options?

[glowcloud]

@glowcloud didn't we forget to assing proper typecasting to these new config options?

We were skipping typecasting for functions before so we need to add it for all of them then.

[char0n]

Looks good, but we need to address the code review comments before this can go in.

[char0n]

We were skipping typecasting for functions before so we need to add it for all of them then.

Let's go for it.

Some reasoning: Let's assume there would nullable-function typecaster. What purpose would it serve?
IMHO the same as nullable-string typescaser. We either get function we can execute or null.
So IMHO it make sense to add nullable-function as it makes what the option can or cannot be explicit.

[glowcloud]

I also noticed that we're missing a few type casters for some default options, which are not defined in our documentation:

• used in system factorization: configs, initialState
  

  swagger-ui/src/core/config/factorization/system.js

  Line 6 in fddb2e1

  const systemFactorization = (options) => {

• used in InlinePlugin factorization: components, fn
  

  swagger-ui/src/core/config/factorization/inline-plugin.js

  Line 5 in fddb2e1

  const InlinePluginFactorization = (options) => () => ({

There's also one default value that I don't see the usage for: custom

[char0n]

configs

it's in defaults, but doesn't have type caster. Should be object typecaster.

initialState

missing from defaults, doesn't have type caster. Should be object typecaster.

components, fn

defined in defaults, don't have type caster. Should be both object typecaster.

[char0n]

Looks good. Nicely done!