chore(credential-providers): use .browser extension for index

[trivikr]

Issue

N/A

Description

We use .browser.ts as an extension for browser specific JS code, and .native.ts extension for react-native specific JS code if it's different from that in the browser.

• https://github.com/aws/aws-sdk-js-v3/blob/main/clients/client-mq/src/runtimeConfig.browser.ts
• https://github.com/aws/aws-sdk-js-v3/blob/main/clients/client-mq/src/runtimeConfig.native.ts

The primary reason for using "browser.ts" could have been due to "browser" configuration in package.json

The .web.ts extension in credential-providers could have been created as it's used in browser as well as react-native. I we want to follow this standard, the packages which are used across browser and react-native will need to be renamed to use -web - like @aws-sdk/util-utf8-browser or @aws-sdk/util-base64-browser, or the packages with -native suffix need to be created which re-exports -browser.

This suggestive PR renames .web.ts to .browser.ts which is one of the options.

Testing

Verified that index.browser.js is transpiled in dist-es

$ credential-providers> yarn run lerna run --scope '@aws-sdk/credential-providers' --include-dependencies build
...

$ credential-providers> ls dist-es
fromCognitoIdentity.js      fromEnv.js               fromProcess.js               fromTokenFile.js  index.js
fromCognitoIdentityPool.js  fromIni.js               fromSSO.js                   fromWebToken.js
fromContainerMetadata.js    fromInstanceMetadata.js  fromTemporaryCredentials.js  index.browser.js

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