WIP: Add Data Structures for Searching

[courtneycb]

WIP. This PR adds the Data Structures for Searching unit plan with 3 lessons for ages 11-14.

Resolves #773

TODO:

• Discuss with Authors what text should be used for 'Key Quesitons' in lesson 1
• Add 'standard text' under Computational Thinking connections header
• Fix formatting of bullet points in the abstraction and evaluation sections on lesson 1
• Resolve inconsistent capitalisation of 'computational thinking' and 'algorithmic thinking' throughout lessons.
• Need to flesh out learning outcomes and computational thinking links for lesson 3. (Discuss with Authors).
• Add tests for generated resources.

[codecov]

Codecov Report

Merging #1124 into develop will decrease coverage by 3.57%.
The diff coverage is 23.33%.

@@             Coverage Diff             @@
##           develop    #1124      +/-   ##
===========================================
- Coverage      100%   96.42%   -3.58%     
===========================================
  Files          118      123       +5     
  Lines         3687     3865     +178     
  Branches       414      442      +28     
===========================================
+ Hits          3687     3727      +40     
- Misses           0      136     +136     
- Partials         0        2       +2

Impacted Files	Coverage Δ
.../generators/HashTableWorksheetResourceGenerator.py	16.85% <16.85%> (ø)
...es/generators/AlphabetToNumberResourceGenerator.py	21.05% <21.05%> (ø)
...urces/generators/RandomNumbersResourceGenerator.py	27.58% <27.58%> (ø)
csunplugged/topics/views.py	98.72% <33.33%> (-1.28%)	⬇️
.../HashTableTwentySlotsWorksheetResourceGenerator.py	45.45% <45.45%> (ø)
...ors/HashTableTenSlotsWorksheetResourceGenerator.py	50% <50%> (ø)
... and 1 more

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