Add management API examples to Dedicated admin docs

[sanderson]

With the new management API, we need to add API examples to the task-based admin docs in Dedicated.

Relevant URLs

Manage databases:

• https://docs.influxdata.com/influxdb/cloud-dedicated/admin/databases/create/
• https://docs.influxdata.com/influxdb/cloud-dedicated/admin/databases/update/
• https://docs.influxdata.com/influxdb/cloud-dedicated/admin/databases/list/
• https://docs.influxdata.com/influxdb/cloud-dedicated/admin/databases/delete/

Manage tables:

• https://docs.influxdata.com/influxdb/cloud-dedicated/admin/tables/create/

Manage tokens:

• https://docs.influxdata.com/influxdb/cloud-dedicated/admin/tokens/database/create/
• https://docs.influxdata.com/influxdb/cloud-dedicated/admin/tokens/database/update/
• https://docs.influxdata.com/influxdb/cloud-dedicated/admin/tokens/database/list/
• https://docs.influxdata.com/influxdb/cloud-dedicated/admin/tokens/database/delete/

Manage data partitioning:

• https://docs.influxdata.com/influxdb/cloud-dedicated/admin/custom-partitions/define-custom-partitions/