Send welcome event and fixes around speech sagas

[compulim]

Fix #1371 and fix #1328.

Background

Since conversationUpdate was not designed for welcome scenario, it lacks of important features required for welcome, e.g. ability to send browser language and information to the bot as the first message.

This PR was designed to add a sample for send welcome event.

But during coding the sample, we talked to redux-saga team because one of their design decision is affecting our code. We settled with their design decision but that forced us to add an interim action (CONNECT_FULFILLING). We revisited all sagas to make sure they can handle successive actions properly.

While revisiting all sagas, we also identified few problematic areas in our sagas:

• First incoming activity came from user will throw null reference exception in saga
• Start/stop speech (TTS) dispatches were scattered across multiple sagas
  • sendEvent will stop speaking, behave same as other postActivity helpers
  • We will consolidate all stop speaking behavior in a new saga
• via argument in setSendBox is never used, removed
• Input hint was not honored in saga (Speech: Microphone not respecting input hint #1328)
  • This could potentially separated in another PR, but since this is a one-line change and we touched all sagas around speech, we will leave it in for now

Although this PR was originally targeted to add a sample with minor-but-broad change on all sagas, since we practically touched almost every sagas, we also revisited problematic areas to make sure they are working as expected.

CHANGELOG.md

Added

• Core: Added sendEvent, in PR #1286
• Core: Added CONNECT_FULFILLING action to workaround redux-saga design decision, in PR #1286

Fixed

• Core: Some sagas missed handling successive actions, in PR #1286
• Core: incomingActivitySaga may throw null-ref exception if the first activity is from user, in PR #1286
• Core: Fix #1328. Should not start microphone if input hint is set to ignoringInput, in PR #1286

Samples

• Backchannel: Send welcome event, in PR #1286

[corinagum]

Fixes #1371

[coveralls]

Pull Request Test Coverage Report for Build 748

• 100 of 139 (71.94%) changed or added relevant lines in 32 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.5%) to 45.443%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
packages/core/src/actions/sendEvent.js	1	2	50.0%
packages/core/src/sagas/markAllAsSpokenOnStopSpeakActivitySaga.js	3	4	75.0%
packages/core/src/sagas/sendEventToPostActivitySaga.js	3	4	75.0%
packages/core/src/sagas/sendPostBackToPostActivitySaga.js	3	4	75.0%
packages/core/src/sagas/startSpeakActivityOnPostActivitySaga.js	3	4	75.0%
packages/component/src/Dictation.js	0	2	0.0%
packages/core/src/sagas/incomingActivitySaga.js	16	18	88.89%
packages/core/src/sagas/removeIncomingTypingAfterIntervalSaga.js	2	4	50.0%
packages/core/src/sagas/effects/whileSpeakIncomingActivity.js	3	6	50.0%
packages/core/src/sagas/markActivityForSpeakOnIncomingActivityFromOthersSaga.js	2	5	40.0%

Totals
Change from base Build 742:	0.5%
Covered Lines:	744
Relevant Lines:	1460

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💛 - Coveralls