Adding __add__ and merge to ChannelTS

[kujaku11]

Adding the __add__ and merge methods to ChannelTS for easier combination of channels.

Under the hood using xarray.combine_by_coords(combine_attrs="override"). This will combine along time as long as the components of the input channels are the same. Then the combined xr.Dataset is reindexed to be a monotonically increasing time series with the proper start and end times. Any time gaps will be filled with the nearest values.

ChannelTS.merge() will do the same but a list of channels can be input, and a sample rate can be set in the event that you want to downsample the data.

• Overwrite __add__ method
• Add merge method
• Update tests
• Update documentation

[codecov-commenter]

Codecov Report

Patch coverage: 44.65% and project coverage change: +5.08 🎉

Comparison is base (22387bf) 53.34% compared to head (7a85cbc) 58.43%.

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Additional details and impacted files

@@             Coverage Diff             @@
##           clients     #136      +/-   ##
===========================================
+ Coverage    53.34%   58.43%   +5.08%     
===========================================
  Files           58      117      +59     
  Lines         7500    12217    +4717     
===========================================
+ Hits          4001     7139    +3138     
- Misses        3499     5078    +1579     

Impacted Files	Coverage Δ
mth5/groups/filter_groups/fir_filter_group.py	36.36% <0.00%> (ø)
mth5/io/miniseed/miniseed.py	45.45% <ø> (ø)
mth5/io/nims/response_filters.py	95.45% <ø> (ø)
mth5/io/phoenix/__init__.py	100.00% <ø> (ø)
mth5/io/phoenix/phoenix_collection.py	16.86% <ø> (ø)
mth5/io/phoenix/read.py	58.33% <ø> (ø)
mth5/io/phoenix/readers/__init__.py	100.00% <ø> (ø)
mth5/io/phoenix/readers/base.py	40.25% <ø> (ø)
mth5/io/phoenix/readers/contiguous/__init__.py	100.00% <ø> (ø)
.../readers/contiguous/decimated_continuous_reader.py	38.23% <ø> (ø)
... and 91 more

... and 1 file with indirect coverage changes

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