[SPIKE] Implement a unified call to all the subgraphs

[alainncls]

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Use the Tools Provided by The Graph

The Graph offers a library called graph-cli to facilitate interactions with subgraphs. Among the many features described here, two examples stand out:

• Cross-chain SDK (parallel SDK calls)
• Cross-chain extension (parallel internal calls with schema extensions)

Note: "Client-side composition" might also be of interest.

[satyajeetkolhapure]

The findings of the SPIKE are captured here

[satyajeetkolhapure]

Conclusion : The sdk exmaples now work with multichain. Although the sdk with multichain is not working in the browser. We need to fix the remaining issues. It is captured in here