fix metaRPCClientFactory id handling

[shanejonas]

Explanation:
these changes affect null and undefined and 0 handling for metaRPC to reflect the JSON-RPC Spec

Rel: MetaMask/json-rpc-middleware-stream#18

[github-actions]

CLA Signature Action: All authors have signed the CLA. You may need to manually re-run the blocking PR check if it doesn't pass in a few minutes.

[metamaskbot]

Builds ready [a860ac0]

• builds: chrome, firefox, opera
• bundle viz: background, ui, inpage, contentscript, ui-libs, bg-libs, phishing-detect
• build viz: Build System
• code coverage: Report
• storybook: Storybook
• all artifacts

Page Load Metrics (637 ± 69 ms)

Platform	Page	Metric	Min (ms)	Max (ms)	Average (ms)	StandardDeviation (ms)	MarginOfError (ms)
Chrome	Home	firstPaint	44	92	67	13	6
		domContentLoaded	367	1144	635	144	69
		load	368	1145	637	144	69
		domInteractive	366	1143	634	144	69

[metamaskbot]

Builds ready [87f30b2]

• builds: chrome, firefox, opera
• bundle viz: background, ui, inpage, contentscript, ui-libs, bg-libs, phishing-detect
• build viz: Build System
• code coverage: Report
• storybook: Storybook
• all artifacts

Page Load Metrics (668 ± 58 ms)

Platform	Page	Metric	Min (ms)	Max (ms)	Average (ms)	StandardDeviation (ms)	MarginOfError (ms)
Chrome	Home	firstPaint	46	132	68	18	9
		domContentLoaded	431	951	666	120	58
		load	432	952	668	120	58
		domInteractive	431	951	666	120	58

[rekmarks]

LGTM!