up-line-or-beginning-search and down-line-or-beginning-search support

[dereckson]

Zle, the line editor from zsh offers two main modes to browse history:

• the one emulated in histdb-interactive.zsh, inspired of bash CTRL + R interactive search
• a more concise syntax from tcsh world "up-line-or-beginning-search" and "down-line-or-beginning-search" where you can search by writing the first letters of your query, then [up] key (or down to scroll back)

Reference: https://github.com/zsh-users/zsh/blob/master/Functions/Zle/up-line-or-beginning-search

Could zsh-histdb support that mode?

To emulate that we would need a function allowing to open the query buffer through _histdb_isearch_query then directly do the _histdb-isearch-up without ofering any special interactive mode.