All accounts social metrics

[volynvlad]

Changes

Add the

• mentions_percentage_twitter
• mentions_percentage_total
• mentions_count_twitter
• mentions_count_total

These metrics are to be used only on the Social Context page and don't given to API users.
To achieve this, the JSON spec of the metric now supports the "is_hidden": true flag, which hides
the metric from the { getAvailableMetrics } and { projectBySlug(slug: "bitcoin"){ availableMetrics }} GraphQL queries.

Ticket

https://www.notion.so/santiment/New-Social-Volume-metric-for-Social-Trends-27200f937c9646f686bd3b4ee6e358ee

Checklist:

• I have performed a self-review of my own code
• I have made corresponding changes to the documentation
• I have tried to find clearer solution before commenting hard-to-understand parts of code
• I have added tests that prove my fix is effective or that my feature works