feat(lambda): inline function code can exceed 4096 bytes (#20624)

CloudFormation removed the 4k charcaters limit for inline function code.

Latest public documentation: https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-properties-lambda-function-code.html#cfn-lambda-function-code-zipfile

Historic documentation: https://web.archive.org/web/20220309033724/https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-properties-lambda-function-code.html#cfn-lambda-function-code-zipfile

Internal Code Review reference: CR-53662636


----

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### Adding new Unconventional Dependencies:

* [ ] This PR adds new unconventional dependencies following the process described [here](https://github.com/aws/aws-cdk/blob/main/CONTRIBUTING.md/#adding-new-unconventional-dependencies)

### New Features

* [ ] Have you added the new feature to an [integration test](https://github.com/aws/aws-cdk/blob/main/INTEGRATION_TESTS.md)?
	* [ ] Did you use `yarn integ` to deploy the infrastructure and generate the snapshot (i.e. `yarn integ` without `--dry-run`)?

*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*

packages/@aws-cdk/aws-lambda/README.md

@@ -29,7 +29,7 @@ runtime code.
  * `lambda.Code.fromBucket(bucket, key[, objectVersion])` - specify an S3 object
    that contains the archive of your runtime code.
  * `lambda.Code.fromInline(code)` - inline the handle code as a string. This is
-   limited to supported runtimes and the code cannot exceed 4KiB.
+   limited to supported runtimes.
  * `lambda.Code.fromAsset(path)` - specify a directory or a .zip file in the local
    filesystem which will be zipped and uploaded to S3 before deployment. See also
    [bundling asset code](#bundling-asset-code).

packages/@aws-cdk/aws-lambda/lib/code.ts

@@ -238,7 +238,7 @@ export class S3Code extends Code {
 }
 
 /**
- * Lambda code from an inline string (limited to 4KiB).
+ * Lambda code from an inline string.
  */
 export class InlineCode extends Code {
   public readonly isInline = true;
@@ -249,10 +249,6 @@ export class InlineCode extends Code {
     if (code.length === 0) {
       throw new Error('Lambda inline code cannot be empty');
     }
-
-    if (code.length > 4096) {
-      throw new Error('Lambda source is too large, must be <= 4096 but is ' + code.length);
-    }
   }
 
   public bind(_scope: Construct): CodeConfig {

packages/@aws-cdk/aws-lambda/test/code.test.ts

@@ -14,10 +14,6 @@ describe('code', () => {
       expect(() => defineFunction(lambda.Code.fromInline('boom'), lambda.Runtime.GO_1_X)).toThrow(/Inline source not allowed for go1\.x/);
       expect(() => defineFunction(lambda.Code.fromInline('boom'), lambda.Runtime.JAVA_8)).toThrow(/Inline source not allowed for java8/);
     });
-    test('fails if larger than 4096 bytes', () => {
-      expect(() => defineFunction(lambda.Code.fromInline(generateRandomString(4097)), lambda.Runtime.NODEJS_14_X))
-        .toThrow(/Lambda source is too large, must be <= 4096 but is 4097/);
-    });
   });
 
   describe('lambda.Code.fromAsset', () => {
@@ -525,11 +521,3 @@ function defineFunction(code: lambda.Code, runtime: lambda.Runtime = lambda.Runt
     runtime,
   });
 }
-
-function generateRandomString(bytes: number) {
-  let s = '';
-  for (let i = 0; i < bytes; ++i) {
-    s += String.fromCharCode(Math.round(Math.random() * 256));
-  }
-  return s;
-}