chore: add helper script to auto update analytics

[daniel-graham-amplitude]

Added a new Node script, "node ./scripts/update-analytics-plugin", that will 1. prompt the user for a version number; 2. download and compress the analytics script from the CDN, with that version number; 3. write the contents to the "amplitude-wrapper.js"

I tested this by following this guide and then ran it on a local "ngrok" server. I had built analytics browser with version 2.11.11 and can confirm that it worked and could send an event to Amplitude from window.amplitudeGTM

(Also, this PR moved "downloadAndDecompress" to a re-usable helper function used by the two scripts)

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scripts/update-sr-plugin.js:7

• [nitpick] The variable 'pluginName' is declared but not used in the shown diff. Consider removing it if it is no longer required to reduce potential confusion.

const pluginName = 'sessionReplayPlugin';

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scripts/update-sr-plugin.js:7

• The variable 'pluginName' is defined but not used anywhere in this script; consider removing it to clean up the code.

const pluginName = 'sessionReplayPlugin';

scripts/helpers.js:4

• Consider adding unit tests for the downloadAndDecompress helper to validate its behavior with various response scenarios, including error cases and proper decompression.

function downloadAndDecompress(url) {

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scripts/update-analytics-plugin.js:20

• Consider adding unit or integration tests for the update-analytics-plugin.js script to verify the version prompt, download, decompression process, and file update behavior.

(async () => {

[Mercy811]

Thanks @daniel-graham-amplitude for adding it. But I just realized that we shouldn't replace it with https://cdn.amplitude.com/libs/analytics-browser-gtm-${version}-min.js.gz. The doc uses packages/analytics-browser/lib/scripts/amplitude-gtm-snippet-min.js. The snippet file is a script loader with with a amplitude client proxy.

iifeGTM
	input:	src/gtm-snippet-index.ts
	output:	
		lib/scripts/amplitude-gtm-min.js
		lib/scripts/amplitude-gtm-min.js.gz
			upload-to-s3.js -> https://cdn.amplitude.com/libs/analytics-browser-gtm-2.11.11-min.js.gz

snippetGTM
	input: 	generated/amplitude-gtm-snippet.js			<- defined in createGTMSnippet()
	output: lib/scripts/amplitude-gtm-snippet-min.js

To automate this, something we are missing

• upload lib/scripts/amplitude-gtm-snippet-min.js to s3 with version name
• pull it in update-analytics-plugin.js

[lewgordon-amplitude]

Nice! Glad to see this added, but I don't have full context what's required here for the browser SDK though.

[daniel-graham-amplitude]

Nice! Glad to see this added, but I don't have full context what's required here for the browser SDK though.

No problem Lew. I just wanted to include you because you had done the session replay version of this.

[Mercy811]

Thank you Dan! LGTM