Remove the power-user command and related catalogers

[wagoodman]

Closes #1419

This PR:

• removes the power-user command
• removes the secrets cataloger
• removes vestiges of the classifier cataloger
• adds a warning when an image being scanned called power-user to tell the user that that command has been removed
• bumps the JSON schema (breaking change) to remove the secrets model from the SBOM

[wagoodman]

JSON schema diff for reviewers:

# diff schema/json/schema-12.0.1.json schema/json/schema-13.0.0.json 
3c3
<   "$id": "anchore.io/schema/syft/json/12.0.1/document",
---
>   "$id": "anchore.io/schema/syft/json/13.0.0/document",
392,397d391
<           },
<           "type": "array"
<         },
<         "secrets": {
<           "items": {
<             "$ref": "#/$defs/Secrets"
2111,2140d2104
<       ]
<     },
<     "SearchResult": {
<       "properties": {
<         "classification": {
<           "type": "string"
<         },
<         "lineNumber": {
<           "type": "integer"
<         },
<         "lineOffset": {
<           "type": "integer"
<         },
<         "seekPosition": {
<           "type": "integer"
<         },
<         "length": {
<           "type": "integer"
<         },
<         "value": {
<           "type": "string"
<         }
<       },
<       "type": "object",
<       "required": [
<         "classification",
<         "lineNumber",
<         "lineOffset",
<         "seekPosition",
<         "length"
2143,2160d2106
<     "Secrets": {
<       "properties": {
<         "location": {
<           "$ref": "#/$defs/Coordinates"
<         },
<         "secrets": {
<           "items": {
<             "$ref": "#/$defs/SearchResult"
<           },
<           "type": "array"
<         }
<       },
<       "type": "object",
<       "required": [
<         "location",
<         "secrets"
<       ]
<     },

[spiffcs]

Nice refactor and pruning going into syft v1.0.0.