fix(util-waiter): expose minDelay and maxDelay for waiters

[alexforsyth]

Issue #, if available:

Description of changes:
Expose the options for minDelay and maxDelay through typescript

import { DynamoDBClient, waitForTableExists } from "@aws-sdk/client-dynamodb"

(async () => {
    const TableName = "MY-TEST-TABLE-1";
  
    const maxWaitTime = 120;
    const client: DynamoDBClient = new DynamoDBClient({});
    let result = await waitForTableExists( { 
        client,
        minDelay: 20,
        maxDelay: 80,
        maxWaitTime: 25 } , { TableName });
    console.log("Table exists", result);
  })();
  

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Resolves: #1806

[codecov-io]

Codecov Report

Merging #1839 (ca7b5db) into master (f2a47e8) will increase coverage by 0.00%.
The diff coverage is 84.21%.

@@           Coverage Diff           @@
##           master    #1839   +/-   ##
=======================================
  Coverage   79.30%   79.31%           
=======================================
  Files         368      368           
  Lines       15132    15146   +14     
  Branches     3222     3229    +7     
=======================================
+ Hits        12001    12013   +12     
- Misses       3131     3133    +2     

Impacted Files	Coverage Δ
packages/util-waiter/src/waiter.ts	100.00% <ø> (ø)
...middleware-user-agent/src/user-agent-middleware.ts	93.10% <66.66%> (ø)
packages/util-waiter/src/utils/validate.ts	81.81% <77.77%> (-18.19%)	⬇️
packages/invalid-dependency/src/invalidProvider.ts	100.00% <100.00%> (ø)
packages/util-waiter/src/createWaiter.ts	100.00% <100.00%> (+11.76%)	⬆️
packages/util-waiter/src/poller.ts	100.00% <100.00%> (ø)
protocol_tests/aws-json/endpoints.ts	81.48% <100.00%> (ø)
lib/storage/src/data-chunk/readable-helper.ts	88.23% <0.00%> (-4.08%)	⬇️
protocol_tests/aws-ec2/endpoints.ts	81.48% <0.00%> (ø)
... and 10 more

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