Allow join to work with BioSymbol

[jakobnissen]

Allow join to work with BioSymbol

Previously, it was only possible to join BioSequences. Now, one can call join(LongRNA{2}, (RNA_U, rna"AGCA")) and have it work. Also skip unneeded calls to resize! when joining

Example use:

julia> join(LongDNA{2}, [dna"AA", DNA_G, RNA_U])
4nt DNA Sequence:
AAGT

Closes #230

Types of changes

This PR implements the following changes:

• [X] :sparkles: New feature (A non-breaking change which adds functionality).
• [ ] :bug: Bug fix (A non-breaking change, which fixes an issue).
• [ ] :boom: Breaking change (fix or feature that would cause existing functionality to change).

:clipboard: Additional detail

:ballot_box_with_check: Checklist

• [X] :art: The changes implemented is consistent with the julia style guide.
• [X] :blue_book: I have updated and added relevant docstrings, in a manner consistent with the documentation styleguide.
• [ ] :blue_book: I have added or updated relevant user and developer manuals/documentation in docs/src/.
• [X] :ok: There are unit tests that cover the code changes I have made.
• [X] :ok: The unit tests cover my code changes AND they pass.
• [X] :pencil: I have added an entry to the [UNRELEASED] section of the manually curated CHANGELOG.md file for this repository.
• [X] :ok: All changes should be compatible with the latest stable version of Julia.
• [X] :thought_balloon: I have commented liberally for any complex pieces of internal code.

[codecov[bot]]

Codecov Report

Merging #234 (bbab04d) into master (fe5aabd) will increase coverage by 0.02%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #234      +/-   ##
==========================================
+ Coverage   89.26%   89.29%   +0.02%     
==========================================
  Files          31       31              
  Lines        2422     2428       +6     
==========================================
+ Hits         2162     2168       +6     
  Misses        260      260              

Flag	Coverage Δ
unittests	89.29% <100.00%> (+0.02%)	:arrow_up:

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

Impacted Files	Coverage Δ
src/biosequence/biosequence.jl	96.72% <100.00%> (+0.35%)	:arrow_up:

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