feature: convenient id incrementation

[sebffischer]

These sugar functions allow do append _<n> to the ids of the dictionary to coveniently increment ids. When retrieving the object "pca_1" this retrieves the object "pca" and sets its id to "pca_1"

Instead of having to write

po("nn_linear", id = "nn_linear_1") %>>%
  po("nn_relu") %>>% 
  po("nn_linear", id = "nn_linear_2") 

it is then possible do write

po("nn_linear_1") %>>%
  po("nn_relu") %>>% 
  po("nn_linear_2") 

Note that one wants to use this in a dictionary, one has to ensure that no key satisfies the regex _\d+$ because then this mechanism is flawed.

[sebffischer]

Martin already reviewed this here: https://github.com/mlr-org/mlr3pipelines/pull/702

[codecov-commenter]

Codecov Report

Merging #80 (742b402) into main (3fe73d1) will decrease coverage by 0.36%. The diff coverage is 72.22%.

@@            Coverage Diff             @@
##             main      #80      +/-   ##
==========================================
- Coverage   80.48%   80.11%   -0.37%     
==========================================
  Files          71       71              
  Lines         999     1016      +17     
==========================================
+ Hits          804      814      +10     
- Misses        195      202       +7     

Impacted Files	Coverage Δ
R/dictionary_sugar.R	68.11% <72.22%> (+3.41%)	:arrow_up:
R/get_seed.R	60.00% <0.00%> (-40.00%)	:arrow_down:
src/keep_in_bounds.c	94.73% <0.00%> (-5.27%)	:arrow_down:

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