Tests for utterance and conversation IDs

[WerLaj]

Fixes #214

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Unit Test Results

73 tests   73 :heavy_check_mark:  1m 5s :stopwatch:   1 suites    0 :zzz:   1 files      0 :x:

Results for commit 41d4a0d4.

:recycle: This comment has been updated with latest results.

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Coverage Report •

File	Stmts	Miss	Cover	Missing
dialoguekit/nlg
template_from_training_data.py	61	1	98%	100
tests/core
test_dialogue.py	99	0	100%
tests/utils
test_dialogue_reader.py	22	0	100%
TOTAL	1849	169	89%

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Current Branch	Main Branch