feat(shared): possibility to follow steam friends

[pedroalves80]

Closes #897

Created endpoints for steam friends and multiple user follows;
Added dialog modal to frontend, so the user can select multiple friends to follow;
Changed avatar size in search to match dialog avatar;

Screenshots (if applicable)

Checks

• !! DONT IGNORE ME !! I have ran nx run db:create-migration <name> and committed the migration if I've made DB schema changes
• I have included/updated tests where applicable (see Testing)
• I have followed semantic commit messages e.g. feat: Add foo, chore: Update bar, etc...
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[tsa96]

Looking good! Don't have many issues, nice work with backend and E2E stuff.

[pedroalves80]

All fixed @tsa96, u can review when u have a chance.