[ui] Attribute / Node: Refacto of the attribute validation paradigm

[nicolas-lambert-tc]

Description

Alicevision related PR

Add a standard way to validate the attribute value.
It add a way to apply validators to an attribute description and to represent in the UI when these attributes are not valid.

Validators

class AttributeValidator(object):

    def __call__(self, node: "Node", attribute: "Attribute") -> tuple[bool, list[str]]: raise NotImplementedError()


class NotEmptyValidator(AttributeValidator):

    def __call__(self, node: "Node", attribute: "Attribute") -> tuple[bool, list[str]]:

        if attribute.value is None or attribute.value == "":
            return error("Empty value are not allowed")
        
        return success()

Validators usage (can be a lambda)

desc.StringParam(
            name="input",
            label="Test input",
            description="",
            value="",
            validators=[
                NotEmptyValidator(),
                lambda node, attribute: success() if attribute == "test" else error("Attribute value should be 'test'")
                ]
        ),

Features list

• Add the notion of reusable validators
• Validator embed the error messages
• Validator can be a lambda
• An icon with error message appear when an attribute value is invalid (at least one validator return error messages)
• A node containing an invalid attribute is tagged with an orange icon and the selection rectangle is orange
• Attribute value is checked every time the attribute value is set (in the Command)
• A Warning Dialog is displayed before trying to submit a graph where a node is in warning state

[codecov]

Codecov Report

❌ Patch coverage is 94.39252% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 78.89%. Comparing base (49ab4b5) to head (48acfec).
⚠️ Report is 949 commits behind head on develop.

Files with missing lines	Patch %	Lines
meshroom/core/desc/validators.py	87.50%	3 Missing ⚠️
meshroom/core/desc/attribute.py	83.33%	2 Missing ⚠️
meshroom/core/attribute.py	96.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2725      +/-   ##
===========================================
+ Coverage    78.57%   78.89%   +0.32%     
===========================================
  Files           48       50       +2     
  Lines         6577     6663      +86     
===========================================
+ Hits          5168     5257      +89     
+ Misses        1409     1406       -3     

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