port: Allow back quotes in adaptive expression object and array construction

[Danieladu]

Fixes #3699

Description

Allow back quotes in adaptive expression object and array construction

Samples:

# StringTemplateWithPureObjectDefinition(item)
- ${{ text: `I would like ${item} today`}}

# StringTemplateWithObjectDefinition(item)
- get 'text' value : ${{ text: `I would like ${item} today`}.text}

# StringTemplateWithPureArrayDefinition(item)
- ${[`I would like ${item} today`]}

# StringTemplateWithArrayDefinition(item)
- get first value : ${[`I would like ${item} today`][0]}

[coveralls]

Pull Request Test Coverage Report for Build 855389886

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.003%) to 85.451%

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Totals
Change from base Build 854509461:	-0.003%
Covered Lines:	19236
Relevant Lines:	21414

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💛 - Coveralls