(ticdc) add cdc engineering and architecture roadmap

[zhangjinpeng87]

What problem does this PR solve?

Issue Number: close https://github.com/pingcap/tiflow/issues/10497

What is changed and how it works?

Add an open roadmap from the engineering and architecture aspects, to express our intension on this open source project in next 1~2 years.

Check List

Tests

• No code

Questions

Will it cause performance regression or break compatibility?

Do you need to update user documentation, design documentation or monitoring documentation?

Release note

`None`.

[ti-chi-bot[bot]]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[ti-chi-bot[bot]]

@zhangjinpeng87: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-cdc-integration-storage-test	42d192f7105c0c3cb55e97d6e29100b0047f5ae8	link	true	/test cdc-integration-storage-test
pull-cdc-integration-pulsar-test	42d192f7105c0c3cb55e97d6e29100b0047f5ae8	link	true	/test cdc-integration-pulsar-test
jenkins-ticdc/verify	42d192f7105c0c3cb55e97d6e29100b0047f5ae8	link	true	/test verify
pull-cdc-integration-kafka-test	42d192f7105c0c3cb55e97d6e29100b0047f5ae8	link	true	/test cdc-integration-kafka-test

Full PR test history. Your PR dashboard.

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