[Feature][SPI] Add DolphinSPILoader

[ruanwenjun]

related issue #6612

[kezhenxu94]

I think #6712 has already simplified the development and usage of the SPI mechanism. I personally think that Java native SPI is already easy to use and the DolphinScheduler’s plugin mechanism is kind of over designed.

[ruanwenjun]

I think #6712 has already simplified the development and usage of the SPI mechanism. I personally think that Java native SPI is already easy to use and the DolphinScheduler’s plugin mechanism is kind of over designed.

Great, I will close this pr.

[kezhenxu94]

#6723 Is another optimization of the alert plugins. I’ll continue to optimize the task plugins and finally we can get rid of the over designed plugin loader and Java developer will find it familiar and comfortable to develop a new plugin. For users it’s also easy to use the plugins without pain