feat(FR-954) setup BAI UI package environment

[nowgnuesLee]

resolves #3617 (FR-954)
In this PR, prepare the setup for the UI package of backend.ai.

changes

• create a backendai-ui project and add to pnpm-workspace.yaml
• setup environment with TS and rollup.
• add a temporary component Button which extended antd's Button component.
• add backend.ai-ui to react's dependencies.
• change tsconfig's target es5 to es2016

Checklist: (if applicable)

• Documentation
• Minium required manager version
• Specific setting for review (eg., KB link, endpoint or how to setup)
• Minimum requirements to check during review
• Test case(s) to demonstrate the difference of before/after

[nowgnuesLee]

• feat(FR-955): move Flex component to backend.ai-ui project #3640
• feat(FR-954) setup BAI UI package environment #3622 👈 (View in Graphite)
• main

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[github-actions]

Coverage report for ./react

St.❔	Category	Percentage	Covered / Total
🔴	Statements	4.09%	409/10004
🔴	Branches	3.44%	240/6967
🔴	Functions	2.48%	79/3184
🔴	Lines	4.02%	394/9789

Test suite run success

124 tests passing in 14 suites.

Report generated by 🧪jest coverage report action from 5bfefd3

[ragingwind]

Please remove properties have the value same as default value. and make sure that what values in tsconfig we should use.