DPL Analysis: rework of aod-spawner and aod-index-builder

[aalkin]

This is a major change, that improves aod-spawner and brings aod-index-builder to the same level.

• aod-index-builder is now generic and does not require hardcoding list of tables to build, this is achieved by introducing specific serializable data structure to encode the recipe of building an index table, similar to how aod-spawner was treated before;
• index table declaration now has a simple sanity check, preventing from using columns that point to tables unrelated to the index table Key;
• both aod-spawner and aod-index-builder are moved into a plugin;
• makeEmptyTable now does not use TableBuilder internally and relies on arrow::Table::MakeEmpty;
• index builder backend was refactored, keeping exactly the same algorithm, but using cleaner helper classes; the code is now out-of-line; the column builders are now allocated only once instead of on every timeframe as before
• new support features (schema and index recipe serialization) are covered by tests;

[github-actions]

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[ktf]

Tested on hyperloop. Merging.