feat: Support multiple tag filters

[yimsk]

Summary

Support filtering resource lists by multiple tag conditions.

Motivation

--tag and :tag currently support a single tag condition. It would be useful to combine tags for common workflows, such as narrowing EC2 instances to prod bastion hosts.

Example

claws -s ec2 --tag Env=prod --tag Role=bastion
claws -s ec2 --tag Env=prod,Role=bastion
startup:
  tags:
    - Env=prod
    - Role=bastion

Multiple tag conditions should be treated as AND filters.