Similarterm, istree and issym only dispatch on objects and not on types. Fix EGraphs tests

[0x0f0f0f]

Needs

JuliaSymbolics/TermInterface.jl#12

to be released

[codecov-commenter]

Codecov Report

Merging #101 (6a7b8e9) into master (40d535e) will increase coverage by 0.20%.
The diff coverage is 85.45%.

@@            Coverage Diff             @@
##           master     #101      +/-   ##
==========================================
+ Coverage   75.40%   75.61%   +0.20%     
==========================================
  Files          15       15              
  Lines        1464     1464              
==========================================
+ Hits         1104     1107       +3     
+ Misses        360      357       -3     

Impacted Files	Coverage Δ
src/Rewriters.jl	33.00% <0.00%> (ø)
src/EGraphs/analysis.jl	75.51% <50.00%> (ø)
src/utils.jl	32.40% <66.66%> (ø)
src/Syntax.jl	82.85% <95.00%> (+0.24%)	⬆️
src/EGraphs/egraph.jl	91.04% <100.00%> (+0.71%)	⬆️
src/EGraphs/ematch.jl	91.60% <100.00%> (ø)
src/EGraphs/saturation.jl	93.60% <100.00%> (ø)
src/Patterns.jl	72.91% <100.00%> (ø)
src/matchers.jl	70.58% <100.00%> (-0.35%)	⬇️
... and 1 more

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