Chat export parameter customisation (#7647)

* use export settings and hide fields

Signed-off-by: Kerry Archibald <kerrya@element.io>

* fix exporter tests

Signed-off-by: Kerry Archibald <kerrya@element.io>

* test ExportDialog with settings

Signed-off-by: Kerry Archibald <kerrya@element.io>

* tidy debugs, rename setting to Parameters

Signed-off-by: Kerry Archibald <kerrya@element.io>

* use reasonable 100gb limit

Signed-off-by: Kerry Archibald <kerrya@element.io>

* use normal setting instead of UIFeature

Signed-off-by: Kerry Archibald <kerrya@element.io>

* use a customisation

Signed-off-by: Kerry Archibald <kerrya@element.io>

* move validateNumberInRange to utils

Signed-off-by: Kerry Archibald <kerrya@element.io>

* use nullish coalesce

Signed-off-by: Kerry Archibald <kerrya@element.io>

* use 8gb size limit for customisation

Signed-off-by: Kerry Archibald <kerrya@element.io>

* update comments

Signed-off-by: Kerry Archibald <kerrya@element.io>

src/utils/validate/index.ts

@@ -0,0 +1 @@
+export * from "./numberInRange";

src/utils/validate/numberInRange.ts

@@ -0,0 +1,9 @@
+
+/**
+ * Validates that a value is
+ * - a number
+ * - in a provided range (inclusive)
+ */
+export const validateNumberInRange = (min: number, max: number) => (value?: number) => {
+    return typeof value === 'number' && !(isNaN(value) || min > value || value > max);
+};