epic: Multiple shard support in TMC

[davidfestal]

TL;DR

Implement the support of multiple shards in the TMC components

Progress tracking #

EPIC detailed issues and overall progress can be tracked with the following project view

Stories

• [x] kcp-dev/kcp#2832
• [x] kcp-dev/kcp#2943
• [x] kcp-dev/kcp#2900
• [ ] kcp-dev/contrib-tmc#45
• [ ] kcp-dev/contrib-tmc#44
• [ ] kcp-dev/kcp#2833
• [ ] Think about what it means for a coordination controller to be shard-aware

[mjudeikis]

/transfer-issue contrib-tmc