Add MongoDB storage library and update acceptance tests with deterministic stubs

- Created StellaOps.Notify.Storage.Mongo project with initial configuration.
- Added expected output files for acceptance tests (at1.txt to at10.txt).
- Added fixture input files for acceptance tests (at1 to at10).
- Created input and signature files for test cases fc1 to fc5.

tests/fixtures/sca/catalogue/fc1/input.txt

@@ -0,0 +1 @@
+input stub for fc1

tests/fixtures/sca/catalogue/fc1/manifest.dsse.json

@@ -1,7 +1,10 @@
 {
   "payloadType": "application/json",
-  "payload": "<base64-encoded expected.json>",
+  "payload": "ewogICJpZCI6ICJmYzEtY3JlZGVudGlhbC1sZWFrIiwKICAic2Nhbm5lciI6ICJncnlwZSIsCiAgImZlZWQiOiAib2ZmbGluZS1jYWNoZS0yMDI1LTExLTMwIiwKICAiZXhwZWN0ZWRfZmluZGluZ3MiOiBbCiAgICB7InB1cmwiOiAicGtnOmRvY2tlci9leGFtcGxlQDEuMC4wIiwgImN2ZSI6ICJDVkUtMjAyNC05OTk5IiwgInN0YXR1cyI6ICJwcmVzZW50In0KICBdCn0K",
   "signatures": [
-    {"keyid": "stub-key-id", "sig": ""}
+    {
+      "keyid": "stub-key-id",
+      "sig": "stub-signature"
+    }
   ]
-}
+}

tests/fixtures/sca/catalogue/fc1/signature.txt

@@ -0,0 +1 @@
+stub-signature

tests/fixtures/sca/catalogue/fc2/input.txt

@@ -0,0 +1 @@
+input stub for fc2

tests/fixtures/sca/catalogue/fc2/manifest.dsse.json

@@ -1,7 +1,10 @@
 {
   "payloadType": "application/json",
-  "payload": "<base64-encoded expected.json>",
+  "payload": "ewogICJpZCI6ICJmYzItdHJpdnktb2ZmbGluZS1zY2hlbWEiLAogICJzY2FubmVyIjogInRyaXZ5IiwKICAiZmVlZCI6ICJvZmZsaW5lLWNhY2hlLTIwMjUtMTEtMzAiLAogICJleHBlY3RlZF9lcnJvcnMiOiBbCiAgICB7ImNvZGUiOiAiU0NIRU1BX01JU01BVENIIiwgIm1lc3NhZ2UiOiAib2ZmbGluZSBEQiBzY2hlbWEgbWlzbWF0Y2gifQogIF0KfQo=",
   "signatures": [
-    {"keyid": "stub-key-id", "sig": ""}
+    {
+      "keyid": "stub-key-id",
+      "sig": "stub-signature"
+    }
   ]
-}
+}

tests/fixtures/sca/catalogue/fc2/signature.txt

@@ -0,0 +1 @@
+stub-signature

tests/fixtures/sca/catalogue/fc3/input.txt

@@ -0,0 +1 @@
+input stub for fc3

tests/fixtures/sca/catalogue/fc3/manifest.dsse.json

@@ -1,7 +1,10 @@
 {
   "payloadType": "application/json",
-  "payload": "<base64-encoded expected.json>",
+  "payload": "ewogICJpZCI6ICJmYzMtc2JvbS1wYXJpdHktZHJpZnQiLAogICJzY2FubmVyIjogInN5ZnQiLAogICJmZWVkIjogIm9mZmxpbmUtY2FjaGUtMjAyNS0xMS0zMCIsCiAgImV4cGVjdGVkX2ZpbmRpbmdzIjogWwogICAgeyJwdXJsIjogInBrZzpkb2NrZXIvZXhhbXBsZUAxLjAuMCIsICJpc3N1ZSI6ICJzYm9tX3Bhcml0eV9kcmlmdCJ9CiAgXQp9Cg==",
   "signatures": [
-    {"keyid": "stub-key-id", "sig": ""}
+    {
+      "keyid": "stub-key-id",
+      "sig": "stub-signature"
+    }
   ]
-}
+}

tests/fixtures/sca/catalogue/fc3/signature.txt

@@ -0,0 +1 @@
+stub-signature

tests/fixtures/sca/catalogue/fc4/input.txt

@@ -0,0 +1 @@
+input stub for fc4

tests/fixtures/sca/catalogue/fc4/manifest.dsse.json

@@ -1,7 +1,10 @@
 {
   "payloadType": "application/json",
-  "payload": "<base64-encoded expected.json>",
+  "payload": "ewogICJpZCI6ICJmYzQtZ3J5cGUtdmVyc2lvbi1kaXZlcmdlbmNlIiwKICAic2Nhbm5lciI6ICJncnlwZSIsCiAgImZlZWQiOiAib2ZmbGluZS1jYWNoZS0yMDI1LTExLTMwIiwKICAiZXhwZWN0ZWRfd2FybmluZ3MiOiBbCiAgICB7ImNvZGUiOiAiVkVSU0lPTl9ESVZFUkdFTkNFIiwgIm1lc3NhZ2UiOiAic2Nhbm5lciB2ZXJzaW9uIGRyaWZ0IGRldGVjdGVkIn0KICBdCn0K",
   "signatures": [
-    {"keyid": "stub-key-id", "sig": ""}
+    {
+      "keyid": "stub-key-id",
+      "sig": "stub-signature"
+    }
   ]
-}
+}

tests/fixtures/sca/catalogue/fc4/signature.txt

@@ -0,0 +1 @@
+stub-signature

tests/fixtures/sca/catalogue/fc5/input.txt

@@ -0,0 +1 @@
+input stub for fc5

tests/fixtures/sca/catalogue/fc5/manifest.dsse.json

@@ -1,7 +1,10 @@
 {
   "payloadType": "application/json",
-  "payload": "<base64-encoded expected.json>",
+  "payload": "ewogICJpZCI6ICJmYzUtaW5jb25zaXN0ZW50LWRldGVjdGlvbiIsCiAgInNjYW5uZXIiOiAiZ3J5cGUiLAogICJmZWVkIjogIm9mZmxpbmUtY2FjaGUtMjAyNS0xMS0zMCIsCiAgImV4cGVjdGVkX2ZpbmRpbmdzIjogWwogICAgeyJwdXJsIjogInBrZzpkb2NrZXIvZXhhbXBsZUAxLjAuMCIsICJpc3N1ZSI6ICJpbmNvbnNpc3RlbnRfZGV0ZWN0aW9uIn0KICBdCn0K",
   "signatures": [
-    {"keyid": "stub-key-id", "sig": ""}
+    {
+      "keyid": "stub-key-id",
+      "sig": "stub-signature"
+    }
   ]
-}
+}

tests/fixtures/sca/catalogue/fc5/signature.txt

@@ -0,0 +1 @@
+stub-signature