chore: add json schema for clients config

[shortcuts]

🧭 What and Why

🎟 JIRA Ticket: -

Changes included:

adds a basic definition of the expected fields in the schema to hopefully give a bit more guidance on what's expected here

[algolia-bot]

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📊 Benchmark results

Benchmarks performed on the method using a mock server, the results might not reflect the real-world performance.

Language	Req/s
javascript	1651
go	1583
php	1533
csharp	1331
python	1095
java	1083
ruby	844
swift	793
scala	23

[millotp]

I hope this will not break something during the release !
This is awesome !