feat(push): add import types for push

[P0labrD]

Based on issue #33
Fix issues #53 and #51

NOTE: This PR is still in draft as it needs more tests.

[adrienaury]

Here is a test case to validate the PR:

tables.yml

version: v1
tables:
  - name: "staff"
    keys:
      - "staff_id"
    columns:
      - name: "staff_id"
      - name: "picture"
        export: "base64"
        import: "[]byte"

❯ lino pull source --filter staff_id=1 --table staff
{"staff_id":1,"picture":"iVBORw0KWgo="}
❯ lino pull source --filter staff_id=1 --table staff | lino push update target --table staff
❯ lino pull target --filter staff_id=1 --table staff
{"staff_id":1,"picture":"iVBORw0KWgo="}