feat: multiple sourcebuffer

[xiaoyuhen]

feat: multiple sourcebuffer

Description

use two sourcebuffer to manage audio and video track

see #14

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-io]

Codecov Report

Merging #49 into master will increase coverage by <.01%.
The diff coverage is 41.66%.

@@            Coverage Diff             @@
##           master      #49      +/-   ##
==========================================
+ Coverage   52.98%   52.99%   +<.01%     
==========================================
  Files         123      123              
  Lines        1659     1672      +13     
==========================================
+ Hits          879      886       +7     
- Misses        780      786       +6

Impacted Files	Coverage Δ
packages/griffith-mp4/src/fmp4/boxes/moov.js	100% <ø> (ø)	⬆️
packages/griffith-mp4/src/mse/controller.js	0% <0%> (ø)	⬆️
packages/griffith-mp4/src/mp4/utils/findBox.js	100% <100%> (ø)	⬆️
...s/griffith-mp4/src/mp4/utils/getSamplesInterval.js	95.08% <100%> (+0.16%)	⬆️
packages/griffith-mp4/src/fmp4/fmp4Generator.js	100% <100%> (ø)	⬆️
packages/griffith-mp4/src/mp4/boxes/elst.js	93.33% <66.66%> (-6.67%)	⬇️

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