cephadm: add support for seastore

cephadm: add support for seastore

This commit adds support for deploying seastore objectstore with
cephdm. This can be done in two ways:

1. using OSD spec file, we can set the objectstore argument to
seastore. eg -
```
service_type: osd
service_id: osd_crimson_seastore
placement:
  host_pattern: '*'
spec:
  objectstore: seastore
  osd_type: crimson
  data_devices:
    all: true
```

2. using --objectstore flag with ceph orch osd deploy. sample cmd:
```
ceph orch apply osd --all-available-devices --osd-type crimson --objectstore seastore
```

Fixes: https://tracker.ceph.com/issues/74616
Signed-off-by: Shraddha Agrawal <shraddha.agrawal000@gmail.com>