Safe Apps Provider: Add xdai chain network id

[mmv08]

This PR:

• Closes Add support for xDai Gnosis Safes #128 by adding network id for xdai

In the future we will make the core sdk return the chain id, removing the need to add an id per network

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Type	Occurrences	Fixable
Errors	0	0
Warnings	2	0
Ignored	0	N/A

• Result: ✅ success

• Annotations: 2 total

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[warning] @typescript-eslint/explicit-module-boundary-types

Require explicit return and argument types on exported functions' and classes' public class methods

• packages/safe-apps-provider/src/provider.ts Line 38 - Argument 'request' should be typed with a non-any type.
• packages/safe-apps-provider/src/provider.ts Line 43 - Argument 'request' should be typed with a non-any type.

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^{Report generated by eslint-plus-action}