feat: support load model.tsx, model.jsx

[paranoidjk]

Use Case

import { message } from 'antd';

....
 effects: {
    *fetch(action, { put, call }) {
      message.loading(<div>Loading some data</div>, 0);
      const result = yield call(fetch);
     message.destory();

...

...

[paranoidjk]

/cc @sorrycc

[coveralls]

Pull Request Test Coverage Report for Build 282

• 0 of 6 (0.0%) changed or added relevant lines in 1 file are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage decreased (-0.02%) to 4.617%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
packages/umi-plugin-dva/src/index.js	0	6	0.0%

Files with Coverage Reduction	New Missed Lines	%
packages/umi-plugin-dva/src/index.js	1	0.0%

Totals
Change from base Build 281:	-0.02%
Covered Lines:	80
Relevant Lines:	1766

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💛 - Coveralls