Remove default permissions from top level of workflows, add workflow_dispatch, etc.

[fxamacker]

Description

• Remove default permissions at top level.
• Grant read permission in jobs.
• Bump actions/checkout from 2 to 3.
• Bump actions/setup-go from 2 to 3.
• Use check-latest feature of setup-go.
• Add workflow_dispatch trigger.
• Add dependabot.yml.
• Bump safer-golangci-lint to 1.46.2.
• Update README to avoid ambiguity between CircleHasht64f, CircleHash64fx, etc.

Closes #261

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

[codecov-commenter]

Codecov Report

Merging #262 (594a923) into main (2f2648f) will increase coverage by 0.16%. The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #262      +/-   ##
==========================================
+ Coverage   69.05%   69.22%   +0.16%     
==========================================
  Files          14       14              
  Lines        7245     7297      +52     
==========================================
+ Hits         5003     5051      +48     
- Misses       1610     1616       +6     
+ Partials      632      630       -2     

Impacted Files	Coverage Δ
array.go	76.15% <0.00%> (-0.34%)	:arrow_down:
storage.go	81.69% <0.00%> (+2.05%)	:arrow_up:

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