Add FFmpegHlsOutputBuilder for HLS user (#322)

 * feat: add hls output builder
 * form: modify addHlsOutput comment
 * fix : fix condition for size
 * feat: check format "hls" in addHlsOutput()
 * fix: duration type change to long
 * test: fix test code to match the code
 * test: fix test code to match the code
 * feat: add addFormatArgs() for hls argument
 * form: add hls format check error mesaage
 * form: add hls_time unit
 * refactor: remove an unnecessary condition addFormatArgs
 * refactor: change return value getThis() to this
 * feat: add AbstractFFmpegOutputBuilder
 * test: test mixed argument with hls, default
 * fix: modify generic in AbstractFFmpegStreamBuilder
 * Move the changes to the outputbuilder to AbstractFFmpegOutputBuilder
 * merge abstractFFmpegStreamBuilder
 * fix: add docs unit parameter
 * fix: javadoc parameter error

Author: van1164