feat: update Lambda's SQS event batch size and add support to batching window

[xiqi]

Update SQS event batch size and add support to batching window according to: https://docs.aws.amazon.com/lambda/latest/dg/with-sqs.html

[medikoo]

@xiqi Thank you, that's nice improvement! Please see my remarks

[medikoo]

@xiqi great thanks for update, and sorry for another turnaround (I didn't look close enough at first time).

To be consistent we need to tackle two more things.

[codecov-io]

Codecov Report

Merging #8555 (d5f7902) into master (d1a22c8) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #8555   +/-   ##
=======================================
  Coverage   87.27%   87.27%           
=======================================
  Files         256      256           
  Lines        9516     9516           
=======================================
  Hits         8305     8305           
  Misses       1211     1211           

Impacted Files	Coverage Δ
...ib/plugins/aws/package/compile/events/sqs/index.js	100.00% <100.00%> (ø)
lib/plugins/aws/provider/awsProvider.js	93.06% <0.00%> (ø)

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[medikoo]

Thank you @xiqi looks really good. I've proposed just some cleanup, so we land with more straightforward construct.

Let me know what you think

[medikoo]

@xiqi it looks great! I've just spotted one omission in schema configuration, and can we have new property be backed by unit test? For that ideally extend already existing runServerless run here:

serverless/lib/plugins/aws/package/compile/events/sqs/index.test.js

Lines 594 to 605 in c9da466

	const { awsNaming, cfTemplate } = await runServerless({
	fixture: 'function',
	configExt: {
	functions: {
	foo: {
	provisionedConcurrency: 1,
	events: [{ sqs: 'arn:aws:sqs:region:account:MyQueue' }],
	},
	},
	},
	cliArgs: ['package'],
	});

1. Configure new function (in configExt property), which would have sns event and maximumBatchingWindow property
2. Then in dedicated it confirm that generated CF resource has expected property and value

For more info on tests, check: https://github.com/serverless/serverless/tree/c9da466875da95584c754b991ec1646998f10018/test#unit-tests

[medikoo]

Thank you @xiqi looks great! I've just proposed to not use JSON.stringify it doesn't seem justified to confirm on JSON stringified values

[medikoo]

Thank you @xiqi !