feat: add API pagination feature flag (#3417)

https://linear.app/unleash/issue/2-826/add-pagination-feature-flag

Adds `apiPagination` feature flag in order to start
https://linear.app/unleash/project/[med][m][none]-api-filter-and-pagination-support-29ef4909dd2e/2

src/lib/__snapshots__/create-config.test.ts.snap

@@ -69,6 +69,7 @@ exports[`should create default config 1`] = `
     "flags": {
       "ENABLE_DARK_MODE_SUPPORT": false,
       "anonymiseEventLog": false,
+      "apiPagination": false,
       "bulkOperations": false,
       "caseInsensitiveInOperators": false,
       "cleanClientApi": false,
@@ -96,6 +97,7 @@ exports[`should create default config 1`] = `
     "experiments": {
       "ENABLE_DARK_MODE_SUPPORT": false,
       "anonymiseEventLog": false,
+      "apiPagination": false,
       "bulkOperations": false,
       "caseInsensitiveInOperators": false,
       "cleanClientApi": false,

src/lib/types/experimental.ts

@@ -81,6 +81,10 @@ const flags = {
         process.env.UNLEASH_EXPERIMENTAL_OPTIMAL_304_DIFFER,
         false,
     ),
+    apiPagination: parseEnvVarBoolean(
+        process.env.UNLEASH_EXPERIMENTAL_API_PAGINATION,
+        false,
+    ),
 };
 
 export const defaultExperimentalOptions: IExperimentalOptions = {