feat: add defaultQuality prop

[TaraLoveCats]

Pull Request Template

Description

Add a optional prop defaultQuality to Griffith, which controls the default definition of a playing video.

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Please also note any relevant details for your test configuration.

• Set a value hd to prop defaultQuality in PlayerContainer , and it works;
• Code logic does not change when no defaultQuality is passed.

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• Any dependent changes have been merged and published in downstream modules

[codecov-commenter]

Codecov Report

Merging #141 into master will decrease coverage by 0.02%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master     #141      +/-   ##
==========================================
- Coverage   49.66%   49.63%   -0.03%     
==========================================
  Files         126      126              
  Lines        1800     1801       +1     
==========================================
  Hits          894      894              
- Misses        906      907       +1     

Impacted Files	Coverage Δ
.../src/components/PlayerContainer/PlayerContainer.js	0.00% <0.00%> (ø)
...th/src/contexts/VideoSource/VideoSourceProvider.js	0.00% <0.00%> (ø)

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