feat: add some functions

[guoxianzhe]

No description provided.

[github-actions]

Coverage Summary

Status	Category	Percentage	Covered / Total
🔵	Lines	90.98%	939 / 1032
🔵	Statements	90.98%	939 / 1032
🔵	Functions	63.82%	60 / 94
🔵	Branches	92.85%	78 / 84

File Coverage

File	Stmts	% Branch	% Funcs	% Lines	Uncovered Lines
src/client.ts	87.86%	100%	50%	87.86%	26-31, 98-99, 144-145, 148-149, 158-160, 163-164, 167-168, 171-172
src/eventemitter.ts	97.72%	93.75%	90%	97.72%	20-21
src/index.ts	53.33%	100%	0%	53.33%	19-20, 22-23, 25-26, 28-29, 31-33, 35-37, 43-60, 62, 68-69
src/top.ts	100%	50%	100%	100%
src/utils.ts	100%	100%	100%	100%
src/tracks/camera-video-track.ts	81.81%	100%	0%	81.81%	10-11, 20-21
src/tracks/local-audio-track.ts	100%	100%	100%	100%
src/tracks/local-track.ts	84.95%	100%	37.5%	84.95%	18-19, 53-61, 70-71, 81-82, 107-108
src/tracks/local-video-track.ts	95.06%	62.5%	83.33%	95.06%	54-55, 76-77
src/tracks/microphone-audio-track.ts	81.81%	100%	0%	81.81%	10-11, 20-21
src/tracks/remote-audio-track.ts	100%	100%	100%	100%
src/tracks/remote-track.ts	87.75%	100%	40%	87.75%	21-22, 38-39, 47-48
src/tracks/remote-video-track.ts	100%	83.33%	100%	100%
src/tracks/track.ts	100%	100%	100%	100%