feat(vulns): add --status filtering

[gabrielvmayer]

Description

This PR adds native --status filtering to python -m conviso.app vulns list, aligned with the Conviso Platform IssueStatusLabel enum (CREATED, DRAFT, IDENTIFIED, IN_PROGRESS, AWAITING_VALIDATION, FIX_ACCEPTED, RISK_ACCEPTED, FALSE_POSITIVE, SUPPRESSED).
The CLI validates the input (case-insensitive, comma-separated) and forwards it to the GraphQL layer so the filtering is performed server-side. README and VERSION were also updated to reflect the new option.

How to Test

1. Check that the flag exists:
   Run python -m conviso.app vulns list --help
   Confirm --status is listed among the options.

2. Validate error handling for invalid values:
   Run python -m conviso.app vulns list --company-id <ID> --status BAD --per-page 1
   Expected behavior: the command should fail fast with a message listing the allowed status values.

3. Verify correct server-side filtering:
   Run python -m conviso.app vulns list --company-id <ID> --status CREATED --all
   Expected behavior: returned vulnerabilities should only have status CREATED.

4. Verify multi-status filtering:
   Run python -m conviso.app vulns list --company-id <ID> --status CREATED,RISK_ACCEPTED --all
   Expected behavior: returned vulnerabilities should only have status CREATED or RISK_ACCEPTED.