[py] optimized Timeouts class by moving timeouts to descriptor class

[sandeepsuryaprasad]

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Description

Moved all timeouts implicit_wait, page_load and script to Descriptor class.

Motivation and Context

• By Moving all timeouts to descriptor class, all 6 properties are being replace with one descriptor class.
• Also the internal method _convert is also eliminated since the logic to convert the value is already present in __get__ method of descriptor, which is same for all three timeouts

Types of changes

• [] Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• [] Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• I have read the contributing document.
• [] My change requires a change to the documentation.
• [] I have updated the documentation accordingly.
• [] I have added tests to cover my changes.
• All new and existing tests passed.

[sandeepsuryaprasad]

Now all UI as well as Unit tests are passing in my local.

[codecov-commenter]

Codecov Report

Patch coverage: 9.09% and project coverage change: -0.33 ⚠️

Comparison is base (669fbb3) 57.44% compared to head (dc4e9b8) 57.11%.

❗ Current head dc4e9b8 differs from pull request most recent head a4fb3a9. Consider uploading reports for the commit a4fb3a9 to get more accurate results

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Additional details and impacted files

@@            Coverage Diff             @@
##            trunk   #12287      +/-   ##
==========================================
- Coverage   57.44%   57.11%   -0.33%     
==========================================
  Files          86       86              
  Lines        5369     5365       -4     
  Branches      193      193              
==========================================
- Hits         3084     3064      -20     
- Misses       2092     2108      +16     
  Partials      193      193              

Impacted Files	Coverage Δ
py/selenium/webdriver/common/timeouts.py	53.65% <9.09%> (-39.68%)	⬇️

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