create: add config_storage template

[elhimov]

@TarantoolBot document
Title: tt create support config_storage template.

Configurable parameters:

• Number of instances in replicaset
• Interval of status checking
• User name
• Password

Example of generated config

Number of instances in replicaset: 3
Interval of status checking: 4
User: me
Password: bla-BLA-bla

instances.yaml

---
replicaset-001-a:
replicaset-001-b:
replicaset-001-c:

config.yaml

credentials:
  users:
    replicator:
      password: 'topsecret'
      roles: [replication]
    me:
      password: 'bla-BLA-bla'
      privileges:
        - permissions: [execute]
          lua_call:
            - config.storage.get
            - config.storage.put
            - config.storage.delete
            - config.storage.keepalive
            - config.storage.txn
            - config.storage.info
        # Not necessary since tarantool 3.5.0, 3.4.1, 3.3.3, 3.2.2.
        - permissions: [read, write]
          spaces: [config_storage, config_storage_meta]

iproto:
  advertise:
    peer:
      login: replicator

replication:
  failover: election

database:
  use_mvcc_engine: true

groups:
  group-001:
    replicasets:
      replicaset-001:
        roles: [config.storage]
        roles_cfg:
          config.storage:
            status_check_interval: 4
        instances:
          replicaset-001-a:
            iproto:
              listen:
              - uri: 127.0.0.1:3301
          replicaset-001-b:
            iproto:
              listen:
              - uri: 127.0.0.1:3302
          replicaset-001-c:
            iproto:
              listen:
              - uri: 127.0.0.1:3303

I didn't forget about:

• Well-written commit messages (see documentation how to write a commit message)
• Don't forget about TarantoolBot in a commit message (see example)
• Tests (see documentation for a testing package)
• Changelog (see documentation for changelog format)

Related issues:

Closes #1180

[oleg-jukovec]

Please, add an example of the generated config into the PR message.

[elhimov]

Please, add an example of the generated config into the PR message.

Done.