Digdag CLI support Backport API enhancement

[toru-takahashi]

The following commit introduced several new APIs. However, they are not supported by CLI https://github.com/treasure-data/digdag/pull/1697

Supporting the following by CLI will help users to manage their projects effeciently.

• GET /api/workflows supports name_pattern parameter to search by workflow name. (partial match).
• GET /api/projects supports name_pattern parameter to search by project name. (partial match).
• GET /api/projects supports count and last_id to change number of return and pagination like /api/workflows.

I assign this to @o-mura

[yoyama]

The options for them has been introduced in #1778