feat: Android proxy

[WcaleNieWolny]

These changes are already in main. I accidentally pushed them with this commit. I will not revert as there are no more changes I want to push and unless someone has some objections, I think the code can say as it.

I will briefly explain how to use proxyRequests.

• First, it's important to mention that it works only for android
• proxyRequests is a regex expression

Here is an example how to use proxyRequests:

1. Set window.InAppBrowserProxyRequest

   const proxyFn = async (call: Request) => {
   const headersObj = call.headers as any as { entries: () => IterableIterator<[string, string]> }
   const headers = Object.fromEntries(headersObj.entries())
   headers['User-Agent'] = 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/130.0.0.0 Safari/537.36'
   if (call.method === 'GET') {
     const proxiedResponse = await CapacitorHttp.get({
       url: 'https://example.com',
       headers: headers
     })
     console.log(JSON.stringify(proxiedResponse))
     return new Response(proxiedResponse.data, { status: proxiedResponse.status, headers: proxiedResponse.headers })
   }
   
   return null
   }
   ((window as any).InAppBrowserProxyRequest)  = proxyFn

2. Set proxyRequests. In my case, I want to proxy all requests

   InAppBrowser.openWebView({ 
     url: 'https://apple.com', 
     headers: {
       'user-agent': 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/130.0.0.0 Safari/537.36'
     },
     proxyRequests: `.*` // match everything
   })

This proxy has some limitations:

• Response supports ONLY text data. Trying to pass a binary stream will cause a failure
• The proxy fn will not be called for POST requests
• For PUT requests, the proxy fn will be called, but the Request will not include the body
• 3xx status codes are not suppored
• content-type header is mandatory
• this proxy works for Android only

/claim #221

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