example: add helloworld example - fast, sufficient and light

[tianweidut]

Description

remove pytorch heavy dependency.

• server run:
• standalone run:
• model build:
• dataset build:

Modules

• [x] Others

Checklist

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

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (07e6c5b) 82.45% compared to head (2fdc38b) 92.04%. Report is 4 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #3000 +/- ## ============================================ + Coverage 82.45% 92.04% +9.59% ============================================ Files 563 124 -439 Lines 30351 14962 -15389 Branches 1826 0 -1826 ============================================ - Hits 25026 13772 -11254 + Misses 4521 1190 -3331 + Partials 804 0 -804 ``` | [Flag](https://app.codecov.io/gh/star-whale/starwhale/pull/3000/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=star-whale) | Coverage Δ | | |---|---|---| | [console](https://app.codecov.io/gh/star-whale/starwhale/pull/3000/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=star-whale) | `?` | | | [controller](https://app.codecov.io/gh/star-whale/starwhale/pull/3000/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=star-whale) | `?` | | | [standalone](https://app.codecov.io/gh/star-whale/starwhale/pull/3000/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=star-whale) | `92.04% <ø> (+0.10%)` | :arrow_up: | | [unittests](https://app.codecov.io/gh/star-whale/starwhale/pull/3000/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=star-whale) | `92.04% <ø> (+0.38%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=star-whale#carryforward-flags-in-the-pull-request-comment) to find out more.

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.