feat(pie-tag): DSW-2550 pie tag icon only mode (v1)

.changeset/four-turtles-collect.md

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+---
+"@justeattakeaway/pie-tag": minor
+---
+
+[Added] - supporting code for icon only mode
+[Updated] - fixed padding in icon only mode

.changeset/slimy-dots-pretend.md

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+---
+"pie-storybook": minor
+---
+
+[Added] - regular story for Tag icon only mode
+[Added] - test stories for Tag icon only mode

.changeset/thick-experts-nail.md

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+---
+"pie-docs": minor
+---
+
+[Added] - page for Tag icon only mode
+[Updated] - content for Tag page regarding icon only mode
+