crimson/os/seastore: drop the replaced seastore/block_off_t

Signed-off-by: Yingxin Cheng <yingxin.cheng@intel.com>

crimson/os/seastore: use device_off_t for offset at seastore level

* Replace the reset of seastore_off_t by the extended device_off_t.
* Extend offset from 32-bit to 56-bit signed integer at seastore level.
* res_paddr_t to embed device_off_t.
* blk_paddr_t to use signed device_off_t for consistency.

Signed-off-by: Yingxin Cheng <yingxin.cheng@intel.com>

crimson/os/seastore: use segment_off_t for segment offsets

Segment offset has range from 32-bit signed integer.

Signed-off-by: Yingxin Cheng <yingxin.cheng@intel.com>

crimson/os/seastore: use extent_len_t where appropriate

Replacing inappropriate usages of seastore_off_t.

Signed-off-by: Yingxin Cheng <yingxin.cheng@intel.com>

crimson/os/seastore: validate segment_size, size and num_segments limits

Signed-off-by: Yingxin Cheng <yingxin.cheng@intel.com>

crimson/os/seastore: relax journal size limit beyound segment-size

Introduce a signed device_off_t type with the 56-bit limit, larger than
the 32-bit seastore_off_t.

Signed-off-by: Yingxin Cheng <yingxin.cheng@intel.com>