Account counters

[yaboiishere]

This PR contains a long migration that indexes various counters for the accounts in the system. It contains a long migration that counts all of the accounts that appear.

This PR adds the account counters for #2125

[Copilot]

Pull Request Overview

This PR introduces a new "AccountCounters" schema and a corresponding endpoint to fetch account activity counters.

• Added a new schema detailing various counter properties (transactions, activities, token counts, etc.).
• Created a new endpoint (/accounts/{accountId}/counters) to retrieve the account counters.

Files not reviewed (19)

• lib/ae_mdw/activities.ex: Language not supported
• lib/ae_mdw/db/contract.ex: Language not supported
• lib/ae_mdw/db/int_transfer.ex: Language not supported
• lib/ae_mdw/db/model.ex: Language not supported
• lib/ae_mdw/db/mutations/int_calls_mutation.ex: Language not supported
• lib/ae_mdw/db/mutations/name_claim_mutation.ex: Language not supported
• lib/ae_mdw/db/mutations/write_field_mutation.ex: Language not supported
• lib/ae_mdw/db/mutations/write_fields_mutation.ex: Language not supported
• lib/ae_mdw/db/sync/id_counter.ex: Language not supported
• lib/ae_mdw/fields.ex: Language not supported
• lib/ae_mdw/names.ex: Language not supported
• lib/ae_mdw/sync/async_tasks/update_tx_stats.ex: Language not supported
• lib/ae_mdw_web/controllers/activity_controller.ex: Language not supported
• lib/ae_mdw_web/router.ex: Language not supported
• priv/migrations/20250404152424_move_account_names_count_to_new_table.ex: Language not supported
• priv/migrations/20250420261832_add_account_counts.ex: Language not supported
• test/ae_mdw/db/contract_call_mutation_test.exs: Language not supported
• test/ae_mdw/db/mutations/write_fields_mutation_test.exs: Language not supported
• test/ae_mdw/db/update_account_name_counts_test.exs: Language not supported