Add simple option to assert entity contain relations.

[dereuromark]

// in some service method at the beginning
public function buildPdf(Product $product): string {
    $product->require('supplier.company.state.country')

    //Render template
}

This avoids the usual kind of hidden and not speaking

warning: 2 :: Attempt to read property "sku" on null

deprecated: 8192 :: strlen(): Passing null to parameter #1 ($string) of type string is deprecated

warning: 2 :: foreach() argument must be of type array|object, null given

etc then inside the business logic or rendering.

---

For hasMany relations this might be a bit trickier and for now maybe out of scope

$product->require('parts.0.company.state.country')

would be the current working solution if we expect parts to always have > 0 records and integer increments.

We could use {n} or {?n} to indicate either any number / numeric key or with ? to make parts optionally also empty:

$product->require('parts.{?n}.company.state.country')

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 86.95652% with 3 lines in your changes missing coverage. Please review.

Project coverage is 83.22%. Comparing base (b4aef4b) to head (af7e4b3).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/Model/Entity/RequireTrait.php	86.95%	3 Missing ⚠️

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Additional details and impacted files

@@             Coverage Diff              @@
##             master     #116      +/-   ##
============================================
+ Coverage     83.17%   83.22%   +0.05%     
- Complexity      728      739      +11     
============================================
  Files            30       31       +1     
  Lines          1676     1699      +23     
============================================
+ Hits           1394     1414      +20     
- Misses          282      285       +3     

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