feat(infura): add Infura WASM FDW for blockchain data (supabase#547)

* feat(infura): add Infura WASM FDW for blockchain data

Add a new WebAssembly Foreign Data Wrapper for querying blockchain data
via Infura JSON-RPC API. Supports Ethereum, Polygon, and other EVM-compatible
networks.

Features:
- 5 resource types: blocks, transactions, balances, logs, chain_info
- Query pushdown for block numbers, transaction hashes, and addresses
- Vault integration for secure API key storage (api_key_id option)
- Rate limit handling with exponential backoff retry
- Import foreign schema support for auto-generating tables

Closes supabase#394

* feat(infura): add documentation and source files

* feat(infura): add FDW implementation and tests

* test(infura): add mock server endpoints and smoke test

* test(infura): add Infura FDW smoke test

* fix issues and improve docs

* add missing columns in test case

---------

Co-authored-by: Bo Lu <[email protected]>

Author: JohnCari

README.md

@@ -20,6 +20,7 @@
 | [Firebase](./wrappers/src/fdw/firebase_fdw)     | A FDW for Google [Firebase](https://firebase.google.com/)                     | ✅   | ❌     |
 | [HelloWorld](./wrappers/src/fdw/helloworld_fdw) | A demo FDW to show how to develop a basic FDW.                                |      |        |
 | [HubSpot](./wasm-wrappers/fdw/hubspot_fdw)      | A Wasm FDW for [HubSpot](https://www.hubspot.com/)                            | ✅   | ❌     |
+| [Infura](./wasm-wrappers/fdw/infura_fdw)        | A Wasm FDW for [Infura](https://www.infura.io/) blockchain data               | ✅   | ❌     |
 | [Logflare](./wrappers/src/fdw/logflare_fdw)     | A FDW for [Logflare](https://logflare.app/)                                   | ✅   | ❌     |
 | [Notion](./wasm-wrappers/fdw/notion_fdw)        | A Wasm FDW for [Notion](https://www.notion.so/)                               | ✅   | ❌     |
 | [Orb](./wasm-wrappers/fdw/orb_fdw)              | A Wasm FDW for [Orb](https://www.withorb.com/)                                | ✅   | ❌     |

docs/catalog/index.md

@@ -24,6 +24,7 @@ Each FDW documentation includes a detailed "Limitations" section that describes
 | Firebase      |   ✅   |   ❌   |   ❌   |   ❌   |    ❌    |    ❌     |
 | Gravatar      |   ✅   |   ❌   |   ❌   |   ❌   |    ❌    |    ❌     |
 | HubSpot       |   ✅   |   ❌   |   ❌   |   ❌   |    ❌    |    ❌     |
+| Infura        |   ✅   |   ❌   |   ❌   |   ❌   |    ❌    |    ✅     |
 | Iceberg       |   ✅   |   ✅   |   ❌   |   ❌   |    ❌    |    ❌     |
 | Logflare      |   ✅   |   ❌   |   ❌   |   ❌   |    ❌    |    ❌     |
 | Notion        |   ✅   |   ❌   |   ❌   |   ❌   |    ❌    |    ❌     |
@@ -51,6 +52,7 @@ See [Developing a Wasm Wrapper](../guides/create-wasm-wrapper.md) for instructio
 | Cloudflare D1 | [Supabase](https://supabase.com) | [Link](cfd1.md)      | [Link](https://github.com/supabase/wrappers/tree/main/wasm-wrappers/fdw/cfd1_fdw)      |
 | Gravatar      | [Automattic](https://automattic.com) | [Link](gravatar.md)  | [Link](https://github.com/Automattic/gravatar-wasm-fdw)  |
 | HubSpot       | [Supabase](https://supabase.com) | [Link](hubspot.md)   | [Link](https://github.com/supabase/wrappers/tree/main/wasm-wrappers/fdw/hubspot_fdw)   |
+| Infura        | [Supabase](https://supabase.com) | [Link](infura.md)    | [Link](https://github.com/supabase/wrappers/tree/main/wasm-wrappers/fdw/infura_fdw)    |
 | Notion        | [Supabase](https://supabase.com) | [Link](notion.md)    | [Link](https://github.com/supabase/wrappers/tree/main/wasm-wrappers/fdw/notion_fdw)    |
 | Orb           | [Supabase](https://supabase.com) | [Link](orb.md)       | [Link](https://github.com/supabase/wrappers/tree/main/wasm-wrappers/fdw/orb_fdw)  |
 | Paddle        | [Supabase](https://supabase.com) | [Link](paddle.md)    | [Link](https://github.com/supabase/wrappers/tree/main/wasm-wrappers/fdw/paddle_fdw)    |