Update test_waits.py add example test_explicity_expected_conditions

[snowlts]

add testcase test_explicity_expected_conditions for /examples/python/tests/waits
/test_waits.py

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Description

add a python example for explicity_wait using expected_conditions;

Motivation and Context

I found that there is no example for explicity_wait using expected_conditions.
so I add it, maybe it will be useful for someone who want to know how to use it

Types of changes

• Change to the site (I have double-checked the Netlify deployment, and my changes look good)
• Code example added (and I also added the example to all translated languages)
• Improved translation
• Added new translation (and I also added a notice to each document missing translation)

Checklist

• I have read the contributing document.
• I have used hugo to render the site/docs locally and I am sure it works.

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[titusfortner]

I'm biased. I don't think anyone should ever use the expected conditions classes when they can use lambdas.

So my preferences is for examples of expected conditions to go into the support section not the waits section.

Regardless, by adding an import at the top, the line references to this file will all need to be changed.