feat: add lists create command

[12ian34]

Summary

• Adds attio lists create subcommand that calls POST /v2/lists to create new lists
• Supports --name, --parent-object (required), plus optional --api-slug, --workspace-access, and repeatable --member-access flags
• Auto-generates api_slug from the name in snake_case when not explicitly provided
• Fixes entries create fails when list has no writable attributes #3: allows entries create and entries assert to proceed with empty entry_values when the list has no custom writable attributes

Usage

# Minimal: create a list for companies
attio lists create --name "Enterprise Sales" --parent-object companies

# With custom slug and access level
attio lists create --name "Enterprise Sales" --parent-object companies \
  --api-slug my_sales_list --workspace-access read-and-write

# With per-member access
attio lists create --name "Private Pipeline" --parent-object companies \
  --member-access "50cf242c-7fa3-4cad-87d0-75b1af71c57b:full-access"

# Quiet mode for scripting
LIST_ID=$(attio lists create --name "New Pipeline" --parent-object deals -q)

# Add a record to a list with no custom attributes (previously failed)
attio entries create my_list --record <record-id> --object companies

Test plan

• 4 new unit tests for lists create in tests/lists.test.ts
• 3 new unit tests for entries empty values fix in tests/entries-empty-values.test.ts
• All 32 tests pass (npm test)
• Build succeeds (npm run build)
• Manual test against live Attio workspace