Add "and" and "or" functions and macros

[tkf]

No description provided.

[codecov]

Codecov Report

Merging #47 (9690543) into main (cd718fa) will increase coverage by 1.77%.
The diff coverage is 93.75%.

@@            Coverage Diff             @@
##             main      #47      +/-   ##
==========================================
+ Coverage   83.02%   84.80%   +1.77%     
==========================================
  Files           6        6              
  Lines         218      250      +32     
==========================================
+ Hits          181      212      +31     
- Misses         37       38       +1     

Flag	Coverage Δ
Pkg.test	84.80% <93.75%> (+1.77%)	⬆️

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Impacted Files	Coverage Δ
src/Try.jl	66.66% <ø> (ø)
src/branch.jl	87.50% <93.75%> (+5.35%)	⬆️

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