timecraft: add log resource type to get and describe commands

[achille-roussel]

This PR adds the log resource type to get and describe.

To list the logs:

$ ./timecraft get log
PROCESS ID                            SEGMENTS  SIZE      STARTED
edd0f0ad-df44-40f7-919c-0a8d52d6de75  1         1.71 KiB  25m ago
20b21493-0445-4a34-af97-a6b7f6658d78  1         28.5 KiB  19m ago

Then describe a specific log:

$ ./timecraft describe log 20b21493-0445-4a34-af97-a6b7f6658d78
ID:      20b21493-0445-4a34-af97-a6b7f6658d78
Size:    28.4 KiB/660 KiB +72 B (compression: 95.69%)
Start:   19m ago, Tue, 30 May 2023 04:10:55 UTC
Records: 3283 (1 batch)
---
SEGMENT  RECORDS  BATCHES  DURATION  SIZE      UNCOMPRESSED SIZE  COMPRESSED SIZE  COMPRESSION RATIO
0        3283     1        9s        28.5 KiB  660 KiB            28.4 KiB         95.69%

Or one of the log segments:

$ ./timecraft describe log 20b21493-0445-4a34-af97-a6b7f6658d78/0
Segment: 0
Size:    28.4 KiB/660 KiB +72 B (compression: 95.69%)
Start:   19m ago, Tue, 30 May 2023 04:11:06 UTC
Records: 3283 (1 batch)
---
RECORDS  FIRST OFFSET  DURATION  UNCOMPRESSED SIZE  COMPRESSED SIZE  COMPRESSION RATIO  COMPRESSION
3283     0             9s        660 KiB            28.4 KiB         95.69%             zstd