[WIP] Add FedADAM into fl_strategies

[ashutosh-b-b]

Description

Initialised FedADAM in fl_strategies as alternative aggregator.

Checklist

• [x] I have followed the Contribution Guidelines and Code of Conduct
• [x] I have commented my code following the NimbleEdge Styleguide
• [x] I have labeled this PR with the relevant Type labels
• [ ] My changes are covered by tests

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