enhance(sdk): export starwhale package functions, classes and consts directly

[tianweidut]

Description

Users can from starwhale import functions, classes, and consts directly which follows the popular package import style.

For the examples with starwhale SDK:

• before:

  from starwhale.api.job import Context
  from starwhale.api.model import PipelineHandler
  from starwhale.api.dataset import Image

• after:

  from starwhale import Image, Context, PipelineHandler
  

Modules

• Python-SDK

Checklist

• run code format and lint check
• add unit test
• add necessary doc

[codecov]

Codecov Report

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❗ Current head 2010565 differs from pull request most recent head 6234a99. Consider uploading reports for the commit 6234a99 to get more accurate results

@@           Coverage Diff           @@
##             main    #1269   +/-   ##
=======================================
  Coverage        ?   73.88%           
  Complexity      ?     1212           
=======================================
  Files           ?      287           
  Lines           ?    13399           
  Branches        ?      651           
=======================================
  Hits            ?     9900           
  Misses          ?     3277           
  Partials        ?      222           

Flag	Coverage Δ
controller	60.87% <0.00%> (?)
standalone	85.64% <0.00%> (?)
unittests	85.64% <0.00%> (?)

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[goldenxinxing]

LGTM

[goldenxinxing]

LGTM