Clean up types in cadence package

[turbolent]

Description

While reviewing #1202 I noticed some tech debt

• Fix naming: Rename cadence.Function to cadence.FunctionType to be consistent with the naming for other types in the package
• Remove unused cadence.Variable and cadence.ResourcePointer. I don't know why they were there
• Fix method receiver names

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• Targeted PR against master branch
• Linked to Github issue with discussion and accepted design OR link to spec that describes this work
• Code follows the standards mentioned here
• Updated relevant documentation
• Re-reviewed Files changed in the Github PR explorer
• Added appropriate labels

[codecov-commenter]

Codecov Report

Merging #1204 (2223bab) into master (55d91b9) will increase coverage by 0.00%.
The diff coverage is 50.00%.

@@           Coverage Diff           @@
##           master    #1204   +/-   ##
=======================================
  Coverage   77.45%   77.46%           
=======================================
  Files         273      273           
  Lines       34766    34764    -2     
=======================================
  Hits        26929    26929           
+ Misses       6762     6760    -2     
  Partials     1075     1075           

Flag	Coverage Δ
unittests	77.46% <50.00%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
runtime/convertTypes.go	79.15% <0.00%> (ø)
types.go	75.40% <0.00%> (+1.21%)	⬆️
encoding/json/decode.go	73.18% <100.00%> (ø)
encoding/json/encode.go	93.42% <100.00%> (ø)

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[dsainati1]

While working on #1202 I also noticed that some primitive static types (namely PrimitiveStaticTypeAuthAccount, PrimitiveStaticTypePublicAccount, PrimitiveStaticTypeAuthAccountContracts, PrimitiveStaticTypePublicAccountContracts and PrimitiveStaticTypeDeployedContract) have no equivalent in the cadence package. Is this intentional or is this also some residual tech debt?

[turbolent]

@dsainati1 No, this is not intentional, they are missing. Good catch!