feat(util-waiter): add createWaiter()

[AllanZhengYP]

Refactors: #1736

Refactor the original waiter util:

1. expose a createWaiter() only to clients in order to reduce the duplicated code-gen
2. fix infinite loop in job poller
3. fix potential number overflow

Example of how clients may use these utils:

const waitForTableExists = (params: DynamoDBWaiter, input: DescribeTableInput): Promise<WaiterResult> => {
    return createWaiter({...waiterServiceDefaults, ...params}, params.client, input, tableExistsPoller);
}

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

[alexforsyth]

@AllanZhengYP and I discussed this offline. LGTM! This is awesome

[codecov-io]

Codecov Report

Merging #1759 (877fc88) into master (de75f7e) will increase coverage by 0.07%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1759      +/-   ##
==========================================
+ Coverage   79.77%   79.85%   +0.07%     
==========================================
  Files         325      338      +13     
  Lines       12087    12644     +557     
  Branches     2553     2684     +131     
==========================================
+ Hits         9643    10097     +454     
- Misses       2444     2547     +103     

Impacted Files	Coverage Δ
...tocol_tests/aws-restxml/commands/XmlMapsCommand.ts	95.65% <0.00%> (-4.35%)	⬇️
...ocol_tests/aws-restxml/commands/XmlBlobsCommand.ts	95.65% <0.00%> (-4.35%)	⬇️
...ocol_tests/aws-restxml/commands/XmlEnumsCommand.ts	95.65% <0.00%> (-4.35%)	⬇️
...ocol_tests/aws-restxml/commands/XmlListsCommand.ts	95.65% <0.00%> (-4.35%)	⬇️
...col_tests/aws-restjson/commands/JsonMapsCommand.ts	95.65% <0.00%> (-4.35%)	⬇️
...ol_tests/aws-restjson/commands/JsonBlobsCommand.ts	95.65% <0.00%> (-4.35%)	⬇️
...ol_tests/aws-restjson/commands/JsonEnumsCommand.ts	95.65% <0.00%> (-4.35%)	⬇️
...ol_tests/aws-restjson/commands/JsonListsCommand.ts	95.65% <0.00%> (-4.35%)	⬇️
...tests/aws-restxml/commands/XmlAttributesCommand.ts	95.65% <0.00%> (-4.35%)	⬇️
...tests/aws-restxml/commands/XmlNamespacesCommand.ts	95.65% <0.00%> (-4.35%)	⬇️
... and 145 more

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