[TwilioAdapter] Replace TwilioAdapter bare Exceptions

[gasper-az]

Fix ISSUE #2415

Description

Replaced bare Exception with ArgumentException and ArgumentNullException in the TwilioAdapter.cs file. Also updated the related test methods.

More Details

Replaced TwilioAdapter's constructor bare Exception with ArgumentException and ArgumentNullException respectively.

Also, updated SendActivitiesAsync method for replacing an Exception an ArgumentException:

All the test methods successfully passed:

[coveralls]

Pull Request Test Coverage Report for Build 75728

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 348 unchanged lines in 50 files lost coverage.
• Overall coverage decreased (-1.9%) to 78.541%

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Files with Coverage Reduction	New Missed Lines	%
/libraries/integration/Microsoft.Bot.Builder.Integration.ApplicationInsights.Core/ApplicationBuilderExtensions.cs	1	71.43%
/libraries/Microsoft.Bot.Builder.AI.LUIS/LuisApplication.cs	1	95.45%
/libraries/Microsoft.Bot.Builder.Dialogs/Prompts/PromptValidatorContext.cs	1	82.35%
/libraries/Microsoft.Bot.Builder.Dialogs/WaterfallStepContext.cs	1	86.96%
/libraries/Microsoft.Bot.Builder/TelemetryLoggerMiddleware.cs	1	73.94%
/libraries/Microsoft.Bot.Builder.Testing/XUnit/TestDataObject.cs	1	82.35%
/libraries/integration/Microsoft.Bot.Builder.Integration.AspNet.Core/HttpHelper.cs	2	90.91%
/libraries/integration/Microsoft.Bot.Builder.Integration.AspNet.Core/ServiceCollectionExtensions.cs	2	94.94%
/libraries/Microsoft.Bot.Builder.AI.LUIS/Generator/DateTimeSpec.cs	2	64.29%
/libraries/Microsoft.Bot.Builder.Azure/CosmosDBKeyEscape.cs	2	89.74%

Totals
Change from base Build 75596:	-1.9%
Covered Lines:	4392
Relevant Lines:	5592

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💛 - Coveralls

[fuselabs]

✔️ No Binary Compatibility issues for Microsoft.Bot.Builder.dll compared against version 4.3.1
✔️ No Binary Compatibility issues for Microsoft.Bot.Builder.AI.Luis.dll compared against version 4.3.1
✔️ No Binary Compatibility issues for Microsoft.Bot.Builder.AI.QnA.dll compared against version 4.3.1
✔️ No Binary Compatibility issues for Microsoft.Bot.Builder.ApplicationInsights.dll compared against version 4.3.1
✔️ No Binary Compatibility issues for Microsoft.Bot.Builder.Azure.dll compared against version 4.3.1
✔️ No Binary Compatibility issues for Microsoft.Bot.Builder.Dialogs.dll compared against version 4.3.1
✔️ No Binary Compatibility issues for Microsoft.Bot.Builder.TemplateManager.dll compared against version 4.3.1
✔️ No Binary Compatibility issues for Microsoft.Bot.Configuration.dll compared against version 4.3.1
✔️ No Binary Compatibility issues for Microsoft.Bot.Connector.dll compared against version 4.3.1
✔️ No Binary Compatibility issues for Microsoft.Bot.Schema.dll compared against version 4.3.1