feat(toCollection): add a new generators to generate collection from …

[manudss]

…a generator function

PR Checklist

Please check if your PR fulfills the following requirements:

• [x] The commit message follows our guidelines: https://github.com/ngneat/falso/blob/master/CONTRIBUTING.md#commit
• [x] Tests for the changes have been added (for bug fixes / features)
• [ ] Docs have been added / updated (for bug fixes / features)

PR Type

Generate a collection from a custom generators functions

@category util

@example

toCollection(() => { return { data: randNumber(); } })

@example

toCollection(() => { return { data: randNumber(); } }, { length: 10 }) // default is no length.

It is a wrapper for the internal fake function.

[ ] Bugfix
[x ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Documentation content changes
[ ] Other... Please describe:

What is the current behavior?

The fake function is internal and can Not bu used externaly.

Issue Number: #301

What is the new behavior?

Does this PR introduce a breaking change?

[ ] Yes
[x ] No