Add access source drivers

Add Driver interface and implementations for Google
Workspace, Linear, Slack, 1Password, HubSpot, DocuSign,
Notion, Brex, Tally, Cloudflare, CSV, Probo memberships,
Sentry, OpenAI, Supabase, GitHub, Intercom, and Resend.
Include name resolvers, VCR test infrastructure with
cassettes, and RFC 5988 link header parser.

Signed-off-by: Aurélien Sibiril <81782+aureliensibiril@users.noreply.github.com>

pkg/accessreview/drivers/testdata/supabase.yaml

@@ -0,0 +1,56 @@
+---
+version: 2
+interactions:
+    - id: 0
+      request:
+        proto: HTTP/1.1
+        proto_major: 1
+        proto_minor: 1
+        content_length: 0
+        host: api.supabase.com
+        headers:
+            Accept:
+                - application/json
+        url: https://api.supabase.com/v1/organizations/acme-corp/members
+        method: GET
+      response:
+        proto: HTTP/2.0
+        proto_major: 2
+        proto_minor: 0
+        content_length: -1
+        uncompressed: true
+        body: '[{"user_id":"a1b2c3d4-e5f6-7890-abcd-ef1234567890","user_name":"jdoe","email":"jdoe@example.com","role_name":"Owner","mfa_enabled":false}]'
+        headers:
+            Access-Control-Allow-Credentials:
+                - "true"
+            Access-Control-Expose-Headers:
+                - x-connection-encrypted,x-forwarded-for,user-agent,CF-Connecting-IP,Retry-After
+            Cf-Cache-Status:
+                - DYNAMIC
+            Cf-Ray:
+                - 000000000000000000-XXX
+            Content-Type:
+                - application/json; charset=utf-8
+            Date:
+                - Thu, 26 Mar 2026 13:18:24 GMT
+            Etag:
+                - W/"94-2d3haQkIE5319yeX5GL6PU8Mh2o"
+            Server:
+                - cloudflare
+            Set-Cookie:
+                - __cf_bm=REDACTED; HttpOnly; Secure; Path=/; Domain=supabase.com; Expires=Thu, 26 Mar 2026 13:48:24 GMT
+            Strict-Transport-Security:
+                - max-age=31536000; includeSubDomains; preload
+            Vary:
+                - Origin
+            X-Powered-By:
+                - Express
+            X-Ratelimit-Limit:
+                - "120"
+            X-Ratelimit-Remaining:
+                - "119"
+            X-Ratelimit-Reset:
+                - "60"
+        status: 200 OK
+        code: 200
+        duration: 156.602041ms