(Polaris icons) Adds dynamic sources icons (Shopify#7105)

Note this PR replaces the [original PR](Shopify#7040) by @gil-- to add the icons. This PR adds the appropriate sized icons and variations.

![image](https://user-images.githubusercontent.com/4304867/188642879-14379135-0778-420c-9c59-e4a4c8952cb9.png)

![image](https://user-images.githubusercontent.com/4304867/188642893-983b4598-a778-49f7-b294-e3ff918beba2.png)


### WHY are these changes introduced?
Adds support for dynamic source iconography in Polaris. Currently used within the theme editor. By adding these icons to polaris, 3rd party app developers can leverage these icons.

### WHAT is this pull request doing?
Adds support for:
- Dynamic source major
- Dynamic source minor
- Insert dynamic source major
- Insert dynamic source minor

![github-icons](https://user-images.githubusercontent.com/4304867/188643353-523540b9-b819-4d0a-adac-2fd874a19c4c.png)

@alex-page I've checked the format/paths, but if you can you please double check to make sure the SVG paths are clean that would be appreciated. Also, I'm not sure what's happening with the changelog error, any idea what might be causing that?

cc @gil-- @leileu

Co-authored-by: Alex Page <[email protected]>
Co-authored-by: Kyle Durand <[email protected]>

Author: 3 people

.changeset/sweet-lamps-relate.md

@@ -0,0 +1,5 @@
+---
+'@shopify/polaris-icons': minor
+---
+
+Add dynamic source icons

polaris-icons/icons/DynamicSourceMajor.svg

@@ -0,0 +1,18 @@
+name: Dynamic Source
+set: major
+description: Used to represent a dynamic source
+keywords:
+  - dynamic source
+  - data source
+  - dynamic
+  - data
+  - datasource
+  - dynamicsource
+  - db
+  - database
+authors:
+  - Russell Baylis
+version: 1
+date_added: 2022-09-06
+date_modified: 2022-09-06
+exclusive_use:

polaris-icons/icons/DynamicSourceMajor.yml

@@ -0,0 +1,18 @@
+name: Dynamic Source
+set: minor
+description: Used to represent a dynamic source
+keywords:
+  - dynamic source
+  - data source
+  - dynamic
+  - data
+  - datasource
+  - dynamicsource
+  - db
+  - database
+authors:
+  - Russell Baylis
+version: 1
+date_added: 2022-09-06
+date_modified: 2022-09-06
+exclusive_use:

polaris-icons/icons/DynamicSourceMinor.svg

@@ -0,0 +1,25 @@
+name: Insert Dynamic Source
+set: major
+description: Used to represent inserting a dynamic source into an input field that supports multiple dynamic sources
+keywords:
+  - dynamic source
+  - data source
+  - dynamic
+  - data
+  - datasource
+  - dynamicsource
+  - dynamic data
+  - add data source
+  - add dynamic source
+  - add
+  - insert
+  - insert data source
+  - insert dynamic source
+  - db
+  - database
+authors:
+  - Russell Baylis
+version: 1
+date_added: 2022-09-06
+date_modified: 2022-09-06
+exclusive_use:

polaris-icons/icons/DynamicSourceMinor.yml

@@ -0,0 +1,25 @@
+name: Insert Dynamic Source
+set: minor
+description: Used to represent inserting a dynamic source into an input field that supports multiple dynamic sources
+keywords:
+  - dynamic source
+  - data source
+  - dynamic
+  - data
+  - datasource
+  - dynamicsource
+  - dynamic data
+  - add data source
+  - add dynamic source
+  - add
+  - insert
+  - insert data source
+  - insert dynamic source
+  - db
+  - database
+authors:
+  - Russell Baylis
+version: 1
+date_added: 2022-09-06
+date_modified: 2022-09-06
+exclusive_use: