Allow flexible use of dependency-graph support

Adds a 'dependency-graph' parameter that has 4 options:
1. 'disabled': no dependency graph files generated (the default)
2. 'generate': dependency graph files will be generated and saved as artifacts.
3. 'generate-and-submit': dependency graph files will be generated, saved as artifacts,
   and submitted to the Dependency Submission API on job completion.
4. 'download-and-submit': any previously uploaded dependency graph artifacts will be downloaded
   and submitted to the Dependency Submission API.

src/input-params.ts

@@ -67,6 +67,23 @@ export function isDependencyGraphEnabled(): boolean {
     return getBooleanInput('generate-dependency-graph', true)
 }
 
+export function getDependencyGraphOption(): DependencyGraphOption {
+    const val = core.getInput('dependency-graph')
+    switch (val.toLowerCase().trim()) {
+        case 'disabled':
+            return DependencyGraphOption.Disabled
+        case 'generate':
+            return DependencyGraphOption.Generate
+        case 'generate-and-submit':
+            return DependencyGraphOption.GenerateAndSubmit
+        case 'download-and-submit':
+            return DependencyGraphOption.DownloadAndSubmit
+    }
+    throw TypeError(
+        `The value '${val} is not valid for 'dependency-graph. Valid values are: [disabled, generate-and-upload, generate-and-submit, download-and-submit]. The default value is 'disabled'.`
+    )
+}
+
 function getBooleanInput(paramName: string, paramDefault = false): boolean {
     const paramValue = core.getInput(paramName)
     switch (paramValue.toLowerCase().trim()) {
@@ -79,3 +96,10 @@ function getBooleanInput(paramName: string, paramDefault = false): boolean {
     }
     throw TypeError(`The value '${paramValue} is not valid for '${paramName}. Valid values are: [true, false]`)
 }
+
+export enum DependencyGraphOption {
+    Disabled,
+    Generate,
+    GenerateAndSubmit,
+    DownloadAndSubmit
+}