feat(ib): scroll to index links in table of contents

[manjotsidhu]

Ref #104

Describe the changes you have made in this PR -

• Added package scroll_to_index
• Added custom headings builder having auto scroll tags by index
• Added action onTap headings in Table of Contents to scroll to the specific action

Screenshots of the changes (If any) -

video_2021-08-05_13-09-30.mp4

[commit-lint]

Bug Fixes

• ib: bug fixes and misc improvements (9fc1fb5)

Features

• ib: scroll to index links in table of contents (1589ae1)

Contributors

manjotsidhu

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[coveralls]

Pull Request Test Coverage Report for Build 1111754165

• 25 of 42 (59.52%) changed or added relevant lines in 4 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage decreased (-0.02%) to 74.142%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
lib/ui/views/ib/builders/ib_headings_builder.dart	10	11	90.91%
lib/services/ib_engine_service.dart	9	15	60.0%
lib/ui/views/ib/ib_page_view.dart	4	14	28.57%

Files with Coverage Reduction	New Missed Lines	%
lib/ui/views/ib/ib_page_view.dart	1	63.08%

Totals
Change from base Build 1107173516:	-0.02%
Covered Lines:	3908
Relevant Lines:	5271

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💛 - Coveralls