fix: multi-byte body lengths for browser

[tkashi]

Issue #, if available:
#1100

Description of changes:
Change implementation of calculateBodyLength for a browser so that multi byte body can be handled.
Add a test for this change as well as ones for this function (since there was no test).

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[codecov-io]

Codecov Report

Merging #1101 into master will decrease coverage by 5.25%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1101      +/-   ##
==========================================
- Coverage   78.79%   73.54%   -5.26%     
==========================================
  Files         279      284       +5     
  Lines       11599    13021    +1422     
  Branches     2402     3033     +631     
==========================================
+ Hits         9140     9576     +436     
- Misses       2459     3445     +986     

Impacted Files	Coverage Δ
packages/util-body-length-browser/src/index.ts	71.42% <ø> (ø)
protocol_tests/aws-ec2/EC2ProtocolClient.ts	96.00% <ø> (ø)
...ws-ec2/commands/EmptyInputAndEmptyOutputCommand.ts	100.00% <ø> (ø)
...ests/aws-ec2/commands/GreetingWithErrorsCommand.ts	100.00% <ø> (ø)
.../aws-ec2/commands/IgnoresWrappingXmlNameCommand.ts	100.00% <ø> (ø)
..._tests/aws-ec2/commands/NestedStructuresCommand.ts	88.23% <ø> (ø)
..._tests/aws-ec2/commands/NoInputAndOutputCommand.ts	100.00% <ø> (ø)
...2/commands/QueryIdempotencyTokenAutoFillCommand.ts	88.23% <ø> (ø)
...otocol_tests/aws-ec2/commands/QueryListsCommand.ts	88.23% <ø> (ø)
...l_tests/aws-ec2/commands/QueryTimestampsCommand.ts	88.23% <ø> (ø)
... and 172 more

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[aws-sdk-js-automation]

AWS CodeBuild CI Report

• CodeBuild project: sdk-staging-test
• Commit ID: 7ef26cd
• Result: SUCCEEDED
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[AllanZhengYP]

@tkashi Thank you a lot for the PR! It makes sense to me. I will approve it after confirming it works in ReactNative

[lock]

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