feat: enable proxy support in the cli

[AayushSaini101]

closes: #862
Related: #1508
Reference:https://www.zenrows.com/blog/node-fetch-proxy#how-to-use-proxy-with-node-fetch of the implementation flow of the proxy

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[AayushSaini101]

As discussed with @Souvikns planning to create a global flags that is proxyHost and proxyPort that can easily help to integrate proxy supports with various commands of the CLI.

Asyncapi generate
Asyncapi validate
Asyncapi convert
Asyncapi optimise

[sonarqubecloud]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud