timecraft: remove log resource type

[achille-roussel]

This PR removes the log resource type, merging the information we were displaying into the process resource type.

Here are a few examples:

$ ./timecraft describe ps 161ee981-4c5b-4599-94a6-b19e2d44dfa4
ID:      161ee981-4c5b-4599-94a6-b19e2d44dfa4
Start:   20h ago, Thu, 01 Jun 2023 13:25:50 PDT
Runtime: timecraft (devel)
Modules:
  sha256:74080192e42e359ae621d939f2b7bb56072f94dce757c42c5de666f25f101aff: (none) (6.82 MiB)
Args:
  http.wasm
  /Users/achilleroussel/wasm/http.wasm
Env:
  ...
Records: 3258, 1 batch(es), 1 segment(s), 28 KiB/660 KiB +72 B (compression: 95.76%)
---
SEGMENT  RECORDS  BATCHES  DURATION  SIZE    UNCOMPRESSED SIZE  COMPRESSED SIZE  COMPRESSION RATIO
0        3258     1        2s        28 KiB  660 KiB            28 KiB           95.76%

$ ./timecraft describe ps 161ee981-4c5b-4599-94a6-b19e2d44dfa4  -o yaml
descriptor:
  mediaType: application/vnd.timecraft.process.v1+json
  digest: sha256:c7a0fd71a36201d0d8692ead66f405b10336b6a5a80e50bb1f42039342ee2191
  size: 388
  annotations:
    timecraft.object.mediatype: application/vnd.timecraft.process.v1+json
data:
  id: 161ee981-4c5b-4599-94a6-b19e2d44dfa4
  startTime: 2023-06-01T20:25:50.7778Z
  config:
    mediaType: application/vnd.timecraft.config.v1+json
    digest: sha256:d4ec352429bc595eacf140f1d2f2712e38c4842b0e8c595b65021e4d8bc42ad5
    size: 2989
    annotations:
      timecraft.object.mediatype: application/vnd.timecraft.config.v1+json
segments:
  - createdAt: "2023-06-01T20:25:54.726597246Z"
    size: 28694
    recordBatches:
      - numRecords: 3258
        firstOffset: 0
        firstTimestamp: "2023-06-01T20:25:54.737847246Z"
        lastTimestamp: "2023-06-01T20:25:57.444562246Z"
        uncompressedSize: 675592
        compressedSize: 28622
        compression: zstd