TiKV-CDC v1.1.0

Key features & improvements

1. Support replicating data with TLS enabled TiKV clusters of both upstream and downstream. See User Guide.
2. Support replication for existing TiKV clusters with data more than 900GB.
3. Support deploying more than 20 changefeeds at the same time.
4. Support specifying key range when deploying changefeed.
5. Polish flow control to avoid Out-Of-Memory.
6. Improve code coverage of unit tests and integration tests.

What's Changed

• [close #211] Add TiKV-CDC config templates by @pingyu in #212
• [close #213] Add TiKV-CDC Chinese manual by @pingyu in #214
• [close #215] Add integration test for TiKV-CDC by @zeminzhou in #216
• [close #232] Add HTTPs as sink URI by @zeminzhou in #233
• [close #241] Fix flow control @zeminzhou in #242
• [close #246] Fix unified sorter @zeminzhou in #247
• [close #248] Fix keyspan sink metrics by @pingyu in #249
• [close #253] Add input event metric for puller @zeminzhou in #254
• [close #250] Remove empty value check in client-go @pingyu in #277
• [close #280] Fix TiKV-CDC stuck when sent SIGSTOP to PD leader @zeminzhou in #286
• [close #287] Fix alertmanager for TiKV-CDC @zeminzhou in #288
• [close #295] Split integrated tests to groups @pingyu in #314