Merge faker.defaultRefDate with faker.seed

[ST-DDT]

Clear and concise description of the problem

When setting faker.seed it isn't clear that you also have to set a fixed defaultRefDate to get reproducible results for the faker.date.*() methods.

Suggested solution

Add a defaultRefDate parameter/option to faker.seed.

Worth discussing:

Should the current (v8 new) faker.defaultRefDate method be removed?

Alternative

Add @see to both methods.

Additional context

Originally suggested here #1870 (comment) by @luisjakon

[luisjakon]

If it's too much of a polluting change, perhaps it might be easier to just have a note or a link on reproducibility and fixation of seed and dates upfront (or early on) in the description as previously suggested. This way, hopefully it's not as surprising as it was to me while testing and running the code. The other thing to consider is whether you might want to have an options object to seed or an engine init function that sets all useful parameters that faker may make use of in all other functions. Other than that, the current solution works fine and can be looked into in another revision. Thanks!

[Shinigami92]

Team Decision

For now we will just aim for better docs (using the alternative @see)

[ST-DDT]

Fixed via #1960