feat: add github handle to member endpoints (IN-834)

[gaspergrom]

Note

Introduces GitHub handle support across member and contributor analytics.

• Adds githubHandle column to members_sorted schema and populates it from memberIdentities in members_sorted_copy_pipe.pipe
• Exposes githubHandle in contributors_leaderboard.pipe and contributor_dependency.pipe outputs
• Propagates githubHandle through leaderboards_members.pipe; updates leaderboards_copy.pipe to include githubHandle (empty string for non-member leaderboards)
• Updates leaderboards_copy_ds.datasource schema/docs to include githubHandle; copy pipe now consolidates 10 leaderboard types

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