feat: adding mdi trend icons

[yhoole-eightfold]

SUMMARY:

Adding the following new icons:

• mdiTrendingDown
• mdiTrendingNeutral
• mdiTrendingUp

GITHUB ISSUE (Open Source Contributors)

JIRA TASK (Eightfold Employees Only):

ENG-48906

CHANGE TYPE:

• Bugfix Pull Request
• Feature Pull Request

TEST COVERAGE:

• Tests for this change already exist
• I have added unittests for this change

TEST PLAN:

Tested in code sandbox

import "./styles.css";
import { IconName, Icon, IconSize } from "@eightfold.ai/octuple";

export default function App() {
  return (
    <div className="App">
      <Icon path={IconName.mdiTrendingDown} color="green" />
      <Icon path={IconName.mdiTrendingNeutral} color="red" />
      <Icon path={IconName.mdiTrendingUp} color="red" />
      
    </div>
  );
}

[codesandbox-ci]

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[sanjeet-eightfold]

Looks good. Can you include the screenshot of what they look like before merging?