[Operations] New operation requests from User Study

[qiaw99]

• least important feature (globaltopk only) least/most globaltopk #122
• least frequent keyword least frequent keyword #116
• include + similar (see comment below)
• custom input rationale Rationalization #117
• buttons for include operations least/most globaltopk #122

[nfelnlp]

For "include + similar", we have to use the temp_dataset here:
https://github.com/nfelnlp/InterroLang/blob/00aa371f15e57c82d25b215acf82acfd5420d324/actions/nlu/similarity.py#L90C50-L90C50

[qiaw99]

@nfelnlp For now, I cann't really imagine a solution that would be able to implement include + similar. The reason is as follows:

1. include relies on temp_dataset.
2. When you call similar operation, e.g. show me the most similar one compared to instance 15. The corresponding parsed text is: filter 15 and similar 1. After doing this, the temp_dataset is already changed, containing only one instance which is id 15.
3. As a result, the previous filtered temp_dataset by include operation will be "removed".

[qiaw99]

In other words, in order to run any include related operations, user couldn't call any operations related to id (filter id and xxx)